| faction | (noun) a dissenting clique | Synonyms: sect |
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| (noun) a clique (often secret) that seeks power usually through intrigue | Synonyms: cabal, camarilla, junto |
| factious | (adjective) dissenting (especially dissenting with the majority opinion) | Synonyms: dissentious, divisive |
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| factitious | (adjective) not produced by natural forces | - |
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| fraction | (noun) a small part or item forming a piece of a whole | - |
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| (noun) the quotient of two rational numbers | - |
| (noun) a component of a mixture that has been separated by a fractional process | - |
| (verb) perform a division | Synonyms: divide |
| fractional | (adjective) constituting or comprising a part or fraction of a possible whole or entirety | Synonyms: partial |
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| (adjective) constituting a division or an aliquot part of the basic monetary unit | Synonyms: divisional |
| fractionate | (verb) obtain by a fractional process | - |
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| (verb) separate into constituents or fractions containing concentrated constituents | - |
| fractionation | (noun) separation into portions | - |
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| (noun) a process that uses heat to separate a substance into its components | Synonyms: fractional process |
| fractious | (adjective) unpredictably difficult in operation; likely to be troublesome | - |
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| (adjective) stubbornly resistant to authority or control | Synonyms: recalcitrant, refractory |
| (adjective) easily irritated or annoyed | Synonyms: cranky, irritable, nettlesome, peckish, peevish, pettish, petulant, scratchy, techy, testy, tetchy |
| fractiously | (adverb) in a fractious manner | - |
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| (adverb) in a peevish manner | Synonyms: peevishly, querulously |
| fractiousness | (noun) the trait of being prone to disobedience and lack of discipline | Synonyms: unruliness, wilfulness, willfulness |
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| galactic | (adjective) of or relating to a galaxy (especially our galaxy the Milky Way) | - |
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| (adjective) inconceivably large | Synonyms: astronomic, astronomical |
| hyperactive | (adjective) more active than normal | Synonyms: overactive |
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| hyperactivity | (noun) a condition characterized by excessive restlessness and movement | - |
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| hypoactive | (adjective) abnormally inactive | Synonyms: underactive |
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| impaction | (noun) a sharp collision produced by striking or dashing against something | Synonyms: impingement |
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| (noun) a disorder in which a tooth is so crowded in its socket that it cannot erupt normally | Synonyms: impacted tooth |
| (noun) a disorder in which feces are impacted in the lower colon | - |
| (noun) the condition of being pressed closely together and firmly fixed | - |
| impracticability | (noun) the quality of not being usable | Synonyms: impracticableness |
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| impracticable | (adjective) not capable of being carried out or put into practice | Synonyms: infeasible, unfeasible, unworkable |
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| impracticableness | (noun) the quality of not being usable | Synonyms: impracticability |
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| impracticably | (adverb) to an impracticable degree | - |
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| impractical | (adjective) not practical; not workable or not given to practical matters | - |
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| (adjective) not practical or realizable; speculative | Synonyms: airy, Laputan, visionary, windy |
| impracticality | (noun) concerned with theoretical possibilities rather than actual use | - |
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| inaction | (noun) the state of being inactive | Synonyms: inactiveness, inactivity |
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| inactivate | (verb) make inactive | Synonyms: deactivate |
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| (verb) release from military service or remove from the active list of military service | Synonyms: demobilise, demobilize |
| inactivation | (noun) breaking up a military unit (by transfers or discharges) | Synonyms: deactivation |
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| (noun) the process of rendering inactive | - |
| inactive | (adjective) (military) not involved in military operations | Synonyms: nonoperational |
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| (adjective) not active physically or mentally | - |
| (adjective) (pathology) not progressing or increasing; or progressing slowly | - |
| (adjective) lacking activity; lying idle or unused | - |
| (adjective) lacking in energy or will | Synonyms: passive |
| (adjective) (of e.g. volcanoes) not erupting and not extinct | Synonyms: dormant |
| (adjective) not exerting influence or change | - |
| (adjective) not engaged in full-time work | - |
| (adjective) not in physical motion | Synonyms: motionless, static, still |
| (adjective) (chemistry) not participating in a chemical reaction; chemically inert | - |
| inactiveness | (noun) a disposition to remain inactive or inert | Synonyms: inactivity, inertia |
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| (noun) the state of being inactive | Synonyms: inaction, inactivity |
| inactivity | (noun) being inactive; being less active | - |
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| (noun) a disposition to remain inactive or inert | Synonyms: inactiveness, inertia |
| (noun) the state of being inactive | Synonyms: inaction, inactiveness |
| inexactitude | (noun) the quality of being inexact | Synonyms: inexactness |
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| infraction | (noun) a crime less serious than a felony | Synonyms: infringement, misdemeanor, misdemeanour, violation |
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| interaction | (noun) a mutual or reciprocal action; interacting | - |
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| (noun) (physics) the transfer of energy between elementary particles or between an elementary particle and a field or between fields; mediated by gauge bosons | Synonyms: fundamental interaction |
| interactional | (adjective) capable of acting on or influencing each other | Synonyms: interactive |
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| interactive | (adjective) used especially of drugs or muscles that work together so the total effect is greater than the sum of the two (or more) | Synonyms: synergistic |
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| (adjective) capable of acting on or influencing each other | Synonyms: interactional |
| intergalactic | (adjective) between or among galaxies | - |
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| jactitate | (verb) move or stir about violently | Synonyms: convulse, slash, thrash, thrash about, thresh, thresh about, toss |
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| jactitation | (noun) (pathology) extremely restless tossing and twitching usually by a person with a severe illness | Synonyms: jactation |
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| (noun) speaking of yourself in superlatives | Synonyms: boast, boasting, self-praise |
| (noun) (law) a false boast that can harm others; especially a false claim to be married to someone (formerly actionable at law) | - |
| lactic | (adjective) of or relating to or obtained from milk (especially sour milk or whey) | - |
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| lactide | (noun) any of a class of heterocyclic compounds, formally acid anhydrides, formed by heating α-lactones. | - |
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| lactifuge | (noun) any agent that reduces milk secretion (as given to a woman who is not breast feeding) | - |
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| liquefaction | (noun) the conversion of a solid or a gas into a liquid | - |
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| malpractice | (noun) a wrongful act that the actor had no right to do; improper professional conduct | - |
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| (noun) professional wrongdoing that results in injury or damage | - |
| nonprotractile | (adjective) not extensile | Synonyms: inextensible, nonextensile |
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| nonpsychoactive | (adjective) not affecting the mind or mental processes | - |
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| nonradioactive | (adjective) not radioactive | - |
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| nonretractile | (adjective) not capable of being retracted | Synonyms: nonretractable |
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| olfaction | (noun) the faculty that enables us to distinguish scents | Synonyms: olfactory modality, sense of smell, smell |
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| olfactive | (adjective) of or relating to olfaction | Synonyms: olfactory |
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| overacting | (noun) poor acting by a ham actor | Synonyms: hamming |
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| overactive | (adjective) more active than normal | Synonyms: hyperactive |
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| overactivity | (noun) excessive activity | - |
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| overreaction | (noun) an excessive reaction; a reaction with inappropriate emotional behavior | - |
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| petrifaction | (noun) a rock created by petrifaction; an organic object infiltrated with mineral matter and preserved in its original form | - |
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| (noun) the process of turning some plant material into stone by infiltration with water carrying mineral particles without changing the original shape | Synonyms: petrification |
| playacting | (noun) the performance of a part or role in a drama | Synonyms: acting, performing, playing |
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| practicability | (noun) the quality of being usable | Synonyms: practicableness |
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| practicable | (adjective) capable of being done with means at hand and circumstances as they are | Synonyms: executable, feasible, viable, workable |
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| (adjective) usable for a specific purpose | Synonyms: operable |
| practicableness | (noun) the quality of being usable | Synonyms: practicability |
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| practicably | (adverb) in a practicable manner; so as to be feasible | Synonyms: feasibly |
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| practical | (adjective) concerned with actual use or practice | - |
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| (adjective) having or put to a practical purpose or use | - |
| (adjective) guided by practical experience and observation rather than theory | Synonyms: hard-nosed, hardheaded, pragmatic |
| (adjective) being actually such in almost every respect | Synonyms: virtual |
| practicality | (noun) concerned with actual use rather than theoretical possibilities | - |
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| practically | (adverb) almost; nearly | - |
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| (adverb) in a practical manner | - |
| (adverb) (degree adverb used before a noun phrase) for all practical purposes but not completely | Synonyms: much |
| practice | (noun) a customary way of operation or behavior | Synonyms: pattern |
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| (noun) systematic training by multiple repetitions | Synonyms: drill, exercise, practice session, recitation |
| (noun) the exercise of a profession | - |
| (noun) translating an idea into action | Synonyms: praxis |
| (noun) knowledge of how something is usually done | - |
| (verb) learn by repetition | Synonyms: drill, exercise, practise |
| (verb) engage in a rehearsal (of) | Synonyms: practise, rehearse |
| (verb) carry out or practice; as of jobs and professions | Synonyms: do, exercise, practise |
| (verb) avail oneself to | Synonyms: apply, use |
| (verb) engage in or perform | Synonyms: commit |
| practiced | (adjective) skillful after much practice | Synonyms: practised |
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| (adjective) having or showing knowledge and skill and aptitude | Synonyms: adept, expert, good, proficient, skilful, skillful |
| practician | (noun) someone who practices a learned profession | Synonyms: practitioner |
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| practise | (verb) learn by repetition | Synonyms: drill, exercise, practice |
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| (verb) engage in a rehearsal (of) | Synonyms: practice, rehearse |
| (verb) carry out or practice; as of jobs and professions | Synonyms: do, exercise, practice |
| practised | (adjective) skillful after much practice | Synonyms: practiced |
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| practitioner | (noun) someone who practices a learned profession | Synonyms: practician |
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| proactive | (adjective) descriptive of any event or stimulus or process that has an effect on events or stimuli or processes that occur subsequently | - |
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| (adjective) (of a policy or person or action) controlling a situation by causing something to happen rather than waiting to respond to it after it happens | - |
| prolactin | (noun) gonadotropic hormone secreted by the anterior pituitary; in females it stimulates growth of the mammary glands and lactation after parturition | Synonyms: lactogenic hormone, luteotropin |
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| prophylactic | (adjective) preventing or contributing to the prevention of disease | Synonyms: preventative, preventive |
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| (adjective) warding off | Synonyms: cautionary |
| (adjective) capable of preventing conception or impregnation | Synonyms: antifertility, contraceptive |
| (noun) contraceptive device consisting of a sheath of thin rubber or latex that is worn over the penis during intercourse | Synonyms: condom, rubber, safe, safety |
| (noun) remedy that prevents or slows the course of an illness or disease | Synonyms: preventative, preventive |
| protactinium | (noun) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead | Synonyms: atomic number 91, Pa, protoactinium |
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| protoactinium | (noun) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead | Synonyms: atomic number 91, Pa, protactinium |
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| protractible | (adjective) able to be extended | Synonyms: protractile |
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| protractile | (adjective) able to be extended | Synonyms: protractible |
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| protraction | (noun) the act of prolonging something | Synonyms: lengthening, perpetuation, prolongation |
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| (noun) the consequence of being lengthened in duration | Synonyms: continuation, lengthiness, prolongation |
| psychoactive | (adjective) affecting the mind or mood or other mental processes | Synonyms: psychotropic |
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| putrefaction | (noun) moral perversion; impairment of virtue and moral principles | Synonyms: corruption, degeneracy, depravation, depravity |
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| (noun) (biology) the process of decay caused by bacterial or fungal action | Synonyms: breakdown, decomposition, rot, rotting |
| (noun) a state of decay usually accompanied by an offensive odor | Synonyms: rot |
| putrefactive | (adjective) causing or promoting bacterial putrefaction | Synonyms: putrefacient |
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| radioactive | (adjective) exhibiting or caused by radioactivity | - |
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| radioactively | (adverb) in a radioactive manner | - |
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| radioactivity | (noun) the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay | Synonyms: radiation |
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| rarefaction | (noun) a decrease in the density of something | - |
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| reaction | (noun) a bodily process occurring due to the effect of some antecedent stimulus or agent | Synonyms: response |
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| (noun) doing something in opposition to another way of doing it that you don't like | - |
| (noun) an idea evoked by some experience | - |
| (noun) extreme conservatism in political or social matters | - |
| (noun) (mechanics) the equal and opposite force that is produced when any force is applied to a body | - |
| (noun) a response that reveals a person's feelings or attitude | - |
| (noun) (chemistry) a process in which one or more substances are changed into others | Synonyms: chemical reaction |
| reactionary | (adjective) opposed to political or social liberalism or reform | Synonyms: far-right, reactionist |
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| (noun) an extreme conservative; an opponent of progress or liberalism | Synonyms: extreme right-winger, ultraconservative |
| reactionism | (noun) the political orientation of reactionaries | - |
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| reactionist | (adjective) opposed to political or social liberalism or reform | Synonyms: far-right, reactionary |
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| reactivate | (verb) activate (an old file) anew | - |
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| reactive | (adjective) participating readily in reactions | - |
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| (adjective) reacting to a stimulus | Synonyms: responsive |
| reactivity | (noun) responsive to stimulation | Synonyms: responsiveness |
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| (noun) ready susceptibility to chemical change | - |
| redaction | (noun) the act of putting something in writing | - |
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| (noun) putting something (as a literary work or a legislative bill) into acceptable form | Synonyms: editing |
| refractile | (adjective) of or relating to or capable of refraction | Synonyms: refractive |
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| refraction | (noun) the amount by which a propagating wave is bent | Synonyms: deflection, deflexion |
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| (noun) the change in direction of a propagating wave (light or sound) when passing from one medium to another | - |
| refractive | (adjective) of or relating to or capable of refraction | Synonyms: refractile |
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| (adjective) capable of changing the direction (of a light or sound wave) | Synonyms: deflective |
| refractiveness | (noun) the physical property of a medium as determined by its index of refraction | Synonyms: refractivity |
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| refractivity | (noun) the physical property of a medium as determined by its index of refraction | Synonyms: refractiveness |
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| retractile | (adjective) capable of retraction; capable of being drawn back | - |
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| retraction | (noun) the act of pulling or holding or drawing a part back | - |
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| (noun) a disavowal or taking back of a previous assertion | Synonyms: abjuration, recantation |
| retroactive | (adjective) descriptive of any event or stimulus or process that has an effect on the effects of events or stimuli or process that occurred previously | - |
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| (adjective) affecting things past | Synonyms: ex post facto, retro |
| retroactively | (adverb) after the fact | - |
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| satisfaction | (noun) act of fulfilling a desire or need or appetite | - |
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| (noun) the contentment one feels when one has fulfilled a desire, need, or expectation | - |
| (noun) compensation for a wrong | Synonyms: atonement, expiation |
| (noun) (law) the payment of a debt or fulfillment of an obligation | - |
| (noun) state of being gratified or satisfied | Synonyms: gratification |
| stalactite | (noun) a cylinder of calcium carbonate hanging from the roof of a limestone cave | - |
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| stupefaction | (noun) the action of stupefying; making dull or lethargic | - |
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| (noun) marginal consciousness | Synonyms: grogginess, semiconsciousness, stupor |
| (noun) a feeling of stupefied astonishment | - |