| absorptivity | (noun) (physics) the property of a body that determines the fraction of the incident radiation or sound flux absorbed or absorbable by the body | Synonyms: absorption factor |
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| acclivity | (noun) an upward slope or grade (as in a road) | Synonyms: ascent, climb, raise, rise, upgrade |
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| activity | (noun) any specific behavior | - |
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| (noun) the trait of being active; moving or acting rapidly and energetically | Synonyms: activeness |
| (noun) an organic process that takes place in the body | Synonyms: bodily function, bodily process, body process |
| (noun) a process existing in or produced by nature (rather than by the intent of human beings) | Synonyms: action, natural action, natural process |
| (noun) the state of being active | Synonyms: action, activeness |
| (noun) (chemistry) the capacity of a substance to take part in a chemical reaction | - |
| brevity | (noun) the attribute of being brief or fleeting | Synonyms: briefness, transience |
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| (noun) the use of brief expressions | - |
| captivity | (noun) the state of being a slave | Synonyms: enslavement |
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| (noun) the state of being imprisoned | Synonyms: immurement, imprisonment, incarceration |
| cavity | (noun) (anatomy) a natural hollow or sinus within the body | Synonyms: bodily cavity, cavum |
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| (noun) a sizeable hole (usually in the ground) | Synonyms: pit |
| (noun) soft decayed area in a tooth; progressive decay can lead to the death of a tooth | Synonyms: caries, dental caries, tooth decay |
| (noun) space that is surrounded by something | Synonyms: enclosed space |
| compulsivity | (noun) the trait of acting compulsively | Synonyms: compulsiveness |
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| concavity | (noun) the property possessed by a concave shape | Synonyms: concaveness |
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| (noun) a shape that curves or bends inward | Synonyms: concave shape, incurvation, incurvature |
| conductivity | (noun) the transmission of heat or electricity or sound | Synonyms: conduction |
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| connectivity | (noun) the property of being connected or the degree to which something has connections | - |
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| correlativity | (noun) a reciprocal relation between two or more things | Synonyms: correlation |
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| creativity | (noun) the ability to create | Synonyms: creative thinking, creativeness |
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| declivity | (noun) a downward slope or bend | Synonyms: declension, declination, decline, descent, downslope, fall |
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| depravity | (noun) a corrupt or depraved or degenerate act or practice | Synonyms: turpitude |
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| (noun) moral perversion; impairment of virtue and moral principles | Synonyms: corruption, degeneracy, depravation, putrefaction |
| directivity | (noun) the property of a microphone or antenna of being more sensitive in one direction than in another | Synonyms: directionality |
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| (noun) the quality of being directive | Synonyms: directiveness |
| effectivity | (noun) power to be effective; the quality of being able to bring about an effect | Synonyms: effectiveness, effectuality, effectualness |
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| electronegativity | (noun) (chemistry) the tendency of an atom or radical to attract electrons in the formation of an ionic bond | Synonyms: negativity |
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| expansivity | (noun) a friendly open trait of a talkative person | Synonyms: effusiveness, expansiveness |
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| (noun) a quality characterized by magnificence of scale or the tendency to expand | Synonyms: expansiveness |
| (noun) the fractional change in length or area or volume per unit change in temperature at a given constant pressure | Synonyms: coefficient of expansion |
| extractivity | (noun) the amount of extract that grains of malt yield. | - |
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| festivity | (noun) any joyous diversion | Synonyms: celebration |
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| gravity | (noun) a manner that is serious and solemn | Synonyms: graveness, soberness, sobriety, somberness, sombreness |
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| (noun) a solemn and dignified feeling | Synonyms: solemnity |
| (noun) (physics) the force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface | Synonyms: gravitation, gravitational attraction, gravitational force |
| hyperactivity | (noun) a condition characterized by excessive restlessness and movement | - |
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| hypersensitivity | (noun) extreme sensitivity | - |
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| (noun) pathological sensitivity | - |
| impassivity | (noun) apathy demonstrated by an absence of emotional reactions | Synonyms: emotionlessness, impassiveness, indifference, phlegm, stolidity, unemotionality |
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| 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 |
| insensitivity | (noun) the inability to respond to affective changes in your interpersonal environment | Synonyms: insensitiveness |
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| intransitivity | (noun) the grammatical relation created by an intransitive verb | Synonyms: intransitiveness |
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| levity | (noun) a manner lacking seriousness | - |
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| (noun) feeling an inappropriate lack of seriousness | - |
| longevity | (noun) duration of service | Synonyms: length of service |
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| (noun) the property of being long-lived | Synonyms: seniority |
| motivity | (noun) the power or ability to move | Synonyms: locomotion, motive power |
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| nativity | (noun) the event of being born | Synonyms: birth, nascence, nascency |
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| negativity | (noun) characterized by habitual skepticism and a disagreeable tendency to deny or oppose or resist suggestions or commands | Synonyms: negativeness, negativism |
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| (noun) (chemistry) the tendency of an atom or radical to attract electrons in the formation of an ionic bond | Synonyms: electronegativity |
| (noun) an amount less than zero | Synonyms: negativeness |
| (noun) the character of the negative electric pole | Synonyms: negativeness |
| objectivity | (noun) judgment based on observable phenomena and uninfluenced by emotions or personal prejudices | Synonyms: objectiveness |
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| obsessivity | (noun) extreme compulsiveness | Synonyms: obsessiveness |
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| overactivity | (noun) excessive activity | - |
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| passivity | (noun) the trait of remaining inactive; a lack of initiative | Synonyms: passiveness |
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| (noun) submission to others or to outside influences | Synonyms: passiveness |
| perceptivity | (noun) a feeling of understanding | Synonyms: insight, perceptiveness |
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| photoconductivity | (noun) change in the electrical conductivity of a substance as a result of absorbing electromagnetic radiation | Synonyms: photoconduction |
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| photosensitivity | (noun) sensitivity to the action of radiant energy | Synonyms: radiosensitivity |
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| positivity | (noun) a quality or state characterized by certainty or acceptance or affirmation and dogmatic assertiveness | Synonyms: positiveness, positivism |
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| (noun) the quality of being encouraging or promising of a successful outcome | Synonyms: advantageousness, favorableness, favourableness, positiveness, profitableness |
| (noun) the quality of being undeniable and not worth arguing about | Synonyms: incontrovertibility, incontrovertibleness, positiveness |
| (noun) an amount greater than zero | Synonyms: positiveness |
| (noun) the character of the positive electric pole | Synonyms: positiveness |
| proclivity | (noun) a natural inclination | Synonyms: leaning, propensity |
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| productivity | (noun) the quality of being productive or having the power to produce | Synonyms: productiveness |
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| (noun) (economics) the ratio of the quantity and quality of units produced to the labor per unit of time | - |
| progressivity | (noun) advancement toward better conditions or policies or methods | Synonyms: progressiveness |
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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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| radiosensitivity | (noun) sensitivity to the action of radiant energy | Synonyms: photosensitivity |
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| reactivity | (noun) responsive to stimulation | Synonyms: responsiveness |
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| (noun) ready susceptibility to chemical change | - |
| receptivity | (noun) willingness or readiness to receive (especially impressions or ideas) | Synonyms: openness, receptiveness |
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| reflectivity | (noun) the ability to reflect beams or rays | Synonyms: reflection, reflexion |
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| (noun) the capability of quiet thought or contemplation | Synonyms: reflectiveness |
| (noun) the fraction of radiant energy that is reflected from a surface | Synonyms: coefficient of reflection, reflectance, reflection factor |
| reflexivity | (noun) the coreferential relation between a reflexive pronoun and its antecedent | Synonyms: reflexiveness |
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| (noun) (logic and mathematics) a relation such that it holds between an element and itself | Synonyms: reflexiveness |
| refractivity | (noun) the physical property of a medium as determined by its index of refraction | Synonyms: refractiveness |
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| relativity | (noun) the quality of being relative and having significance only in relation to something else | - |
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| (noun) (physics) the theory that space and time are relative concepts rather than absolute concepts | Synonyms: Einstein's theory of relativity, relativity theory, theory of relativity |
| reluctivity | (noun) (physics) the resistance of a material to the establishment of a magnetic field in it | - |
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| resistivity | (noun) a material's opposition to the flow of electric current; measured in ohms | Synonyms: electric resistance, electrical resistance, impedance, ohmic resistance, resistance |
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| retentivity | (noun) the power of retaining liquid | Synonyms: retention, retentiveness |
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| (noun) the property of retaining possessions that have been acquired | Synonyms: retentiveness |
| (noun) the power of retaining and recalling past experience | Synonyms: memory, retention, retentiveness |
| selectivity | (noun) the property of being selective | - |
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| sensitivity | (noun) the ability to respond to physical stimuli or to register small physical amounts or differences | Synonyms: sensitiveness |
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| (noun) the ability to respond to affective changes in your interpersonal environment | Synonyms: sensitiveness |
| (noun) (physiology) responsiveness to external stimuli; the faculty of sensation | Synonyms: sensibility, sensitiveness |
| (noun) sensitivity to emotional feelings (of self and others) | Synonyms: sensitiveness |
| (noun) susceptibility to a pathogen | Synonyms: predisposition |
| suavity | (noun) the quality of being bland and gracious or ingratiating in manner | Synonyms: blandness, smoothness, suaveness |
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| subjectivity | (noun) judgment based on individual personal impressions and feelings and opinions rather than external facts | Synonyms: subjectiveness |
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| superconductivity | (noun) the disappearance of electrical resistance at very low temperatures | - |
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| transitivity | (noun) the grammatical relation created by a transitive verb | Synonyms: transitiveness |
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| (noun) (logic and mathematics) a relation between three elements such that if it holds between the first and second and it also holds between the second and third it must necessarily hold between the first and third | - |