| notional | (adjective) being of the nature of a notion or concept | Synonyms: conceptional, ideational |
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| (adjective) indulging in or influenced by fancy | Synonyms: fanciful |
| (adjective) not based on fact or investigation | Synonyms: speculative |
| (adjective) not based on fact; existing only in the imagination | Synonyms: fanciful, imaginary |
| nutritional | (adjective) of or relating to or providing nutrition | Synonyms: nutritionary |
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| obligational | (adjective) relating or constituting or qualified to create a legal or financial obligation | - |
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| observational | (adjective) relying on observation or experiment | Synonyms: data-based, experimental |
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| obsessional | (adjective) characterized by or constituting an obsession | Synonyms: obsessive |
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| occasional | (adjective) occurring from time to time | - |
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| (adjective) occurring on a temporary or irregular basis | Synonyms: casual |
| (adjective) recurring or reappearing from time to time | Synonyms: periodic |
| (adjective) occurring or appearing at usually irregular intervals | Synonyms: episodic |
| occupational | (adjective) of or relating to the activity or business for which you are trained | - |
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| octagonal | (adjective) of or relating to or shaped like an octagon | Synonyms: octangular |
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| omnidirectional | (adjective) not directional | - |
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| operational | (adjective) (military) of or intended for or involved in military operations | - |
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| (adjective) pertaining to a process or series of actions for achieving a result | - |
| (adjective) being in effect or operation | Synonyms: in operation, operating |
| (adjective) fit or ready for use or service | Synonyms: functional, operable, usable, useable |
| optional | (adjective) possible but not necessary; left to personal choice | - |
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| ordinal | (adjective) being or denoting a numerical order in a series | - |
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| (adjective) of or relating to a taxonomic order | - |
| (noun) the number designating place in an ordered sequence | Synonyms: no., ordinal number |
| organisational | (adjective) of or relating to an organization | Synonyms: organizational |
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| organizational | (adjective) of or relating to an organization | Synonyms: organisational |
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| original | (adjective) being or productive of something fresh and unusual; or being as first made or thought of | - |
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| (adjective) (of e.g. information) not secondhand or by way of something intermediary | - |
| (adjective) not derived or copied or translated from something else | - |
| (adjective) preceding all others in time or being as first made or performed | - |
| (noun) an original creation (i.e., an audio recording) from which copies can be made | Synonyms: master, master copy |
| (noun) something that serves as a model or a basis for making copies | Synonyms: archetype, pilot |
| orthogonal | (adjective) not pertinent to the matter under consideration | Synonyms: extraneous, immaterial, impertinent |
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| (adjective) having a set of mutually perpendicular axes; meeting at right angles | Synonyms: rectangular |
| (adjective) statistically unrelated | - |
| overemotional | (adjective) excessively or abnormally emotional | Synonyms: sloppy |
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| paraprofessional | (noun) a trained worker who is not a member of a profession but who assists a professional | - |
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| paternal | (adjective) characteristic of a father | - |
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| (adjective) relating to or characteristic of or befitting a parent | Synonyms: maternal, parental |
| (adjective) belonging to or inherited from one's father | - |
| (adjective) related on the father's side | Synonyms: agnate, agnatic |
| penal | (adjective) of or relating to punishment | - |
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| (adjective) (of an act or offense) subject to punishment by law | Synonyms: punishable |
| (adjective) serving as or designed to impose punishment | - |
| pentagonal | (adjective) of or relating to or shaped like a pentagon | Synonyms: pentangular |
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| perianal | (adjective) around the anus | - |
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| perigonal | (adjective) of or relating to a perigone | - |
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| perirhinal | (adjective) near the nose | Synonyms: perinasal |
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| personal | (adjective) concerning or affecting a particular person or his or her private life and personality | - |
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| (adjective) indicating grammatical person | - |
| (adjective) of or arising from personality | - |
| (adjective) intimately concerning a person's body or physical being | - |
| (noun) a short newspaper article about a particular person or group | - |
| phenomenal | (adjective) of or relating to a phenomenon | - |
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| (adjective) extraordinarily good or great; used especially as intensifiers | Synonyms: fantastic, grand, howling, marvellous, marvelous, rattling, terrific, tremendous, wonderful, wondrous |
| platitudinal | (adjective) dull and tiresome but with pretensions of significance or originality | Synonyms: bromidic, corny, platitudinous |
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| polygonal | (adjective) having many sides or relating to a surface marked by polygons | - |
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| polytonal | (adjective) using more than one key or tonality simultaneously | - |
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| positional | (adjective) of or relating to or determined by position | - |
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| postulational | (adjective) of or relating to or derived from axioms | Synonyms: axiomatic, axiomatical |
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| preanal | (adjective) situated in front of the anus | - |
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| precautional | (adjective) taken in advance to protect against possible danger or failure | Synonyms: precautionary |
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| prenominal | (adjective) of adjectives; placed before the nouns they modify | Synonyms: attributive |
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| prepositional | (adjective) of or relating to or formed with a preposition | - |
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| presentational | (adjective) of or relating to a presentation (especially in psychology or philosophy) | - |
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| processional | (adjective) of or relating to or characteristic of a procession | - |
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| (adjective) intended for use in a procession | - |
| (noun) religious music used in a procession | Synonyms: prosodion |
| professional | (adjective) engaged in a profession or engaging in as a profession or means of livelihood | - |
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| (adjective) characteristic of or befitting a profession or one engaged in a profession | - |
| (adjective) of or relating to a profession | - |
| (adjective) of or relating to or suitable as a profession | - |
| (adjective) engaged in by members of a profession | - |
| (noun) a person engaged in one of the learned professions | Synonyms: professional person |
| (noun) an authority qualified to teach apprentices | Synonyms: master |
| (noun) an athlete who plays for pay | Synonyms: pro |
| progestational | (adjective) preceding and favoring gestation; of or relating to physiological changes associated with ovulation and formation of the corpus luteum | - |
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| (adjective) of or relating to progesterone (or to a drug with effects like those of progesterone) | - |
| promotional | (adjective) of or relating to serving as publicity | - |
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| (adjective) of or relating to advancement | - |
| pronominal | (adjective) relating to pronouns | - |
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| (noun) a phrase that functions as a pronoun | Synonyms: pronominal phrase |
| propanal | (noun) a colorless liquid aldehyde | Synonyms: propionaldehyde |
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| propenal | (noun) a pungent colorless unsaturated liquid aldehyde made from propene | Synonyms: acrolein |
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| proportional | (adjective) properly related in size or degree or other measurable characteristics; usually followed by `to' | Synonyms: relative |
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| (adjective) having a constant ratio | - |
| (noun) one of the quantities in a mathematical proportion | - |
| provisional | (adjective) under terms not final or fully worked out or agreed upon | Synonyms: probationary, provisionary, tentative |
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| quarterfinal | (noun) one of the four competitions in an elimination tournament whose winners go on to play in the semifinals | - |
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| rational | (adjective) consistent with or based on or using reason | - |
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| (adjective) capable of being expressed as a quotient of integers | - |
| (adjective) having its source in or being guided by the intellect (as distinguished from experience or emotion) | - |
| (adjective) of or associated with or requiring the use of the mind | Synonyms: intellectual, noetic |
| (noun) an integer or a fraction | Synonyms: rational number |
| recessional | (adjective) of or relating to receding | - |
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| (noun) a hymn that is sung at the end of a service as the clergy and choir withdraw | - |
| (noun) the withdrawal of the clergy and choir from the chancel to the vestry at the end of a church service | Synonyms: recession |
| recreational | (adjective) of or relating to recreation | - |
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| (adjective) engaged in as a pastime | Synonyms: amateur, unpaid |
| redemptional | (adjective) of or relating to or resulting in redemption | Synonyms: redemptive, redemptory |
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| regional | (adjective) characteristic of a region | - |
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| (adjective) related or limited to a particular region | - |
| relational | (adjective) having a relation or being related | - |
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| renal | (adjective) of or relating to the kidneys | Synonyms: nephritic |
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| representational | (adjective) (used especially of art) depicting objects, figures,or scenes as seen | - |
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| retinal | (adjective) in or relating to the retina of the eye | - |
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| (noun) either of two yellow to red retinal pigments formed from rhodopsin by the action of light | Synonyms: retinene |
| rhinal | (adjective) of or in or relating to the nose | Synonyms: nasal |
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| rotational | (adjective) of or pertaining to rotation | - |
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| seasonal | (adjective) occurring at or dependent on a particular season | - |
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| (noun) a worker who finds employment only in certain seasons | Synonyms: seasonal worker |
| sectional | (adjective) relating to or based upon a section (i.e. as if cut through by an intersecting plane) | - |
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| (adjective) consisting of or divided into sections | Synonyms: sectioned |
| (adjective) related or limited to a distinct region or subdivision of a territory or community or group of people | - |
| (noun) a piece of furniture made up of sections that can be arranged individually or together | - |
| semifinal | (noun) one of the two competitions in the next to the last round of an elimination tournament | Synonyms: semi |
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| seminal | (adjective) pertaining to or containing or consisting of semen | - |
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| (adjective) containing seeds of later development | Synonyms: germinal, originative |
| semiprofessional | (noun) an athlete who plays for pay on a part-time basis | Synonyms: semipro |
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| sempiternal | (adjective) having no known beginning and presumably no end | Synonyms: dateless, endless |
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| sensational | (adjective) causing intense interest, curiosity, or emotion | - |
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| (adjective) relating to or concerned in sensation | Synonyms: sensory |
| (adjective) commanding attention | Synonyms: arresting, stunning |
| septrional | (adjective) of northern regions; from the seven stars (or seven plowing oxen) of Ursa Major | - |
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| signal | (adjective) notably out of the ordinary | - |
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| (noun) any nonverbal action or gesture that encodes a message | Synonyms: sign, signaling, signalling |
| (noun) any incitement to action | - |
| (noun) an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes | - |
| (verb) communicate silently and non-verbally by signals or signs | Synonyms: sign, signalise, signalize |
| (verb) be a signal for or a symptom of | Synonyms: bespeak, betoken, indicate, point |
| spinal | (adjective) of or relating to the spine or spinal cord | - |
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| (noun) anesthesia of the lower half of the body; caused by injury to the spinal cord or by injecting an anesthetic beneath the arachnoid membrane that surrounds the spinal cord | Synonyms: spinal anaesthesia, spinal anesthesia |
| sternal | (adjective) of or relating to or near the sternum | - |
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| subliminal | (adjective) below the threshold of conscious perception | - |
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| subterminal | (adjective) near but not precisely at an end | - |
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| summational | (adjective) of or relating to a summation or produced by summation | Synonyms: summative |
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| supernal | (adjective) being or coming from on high | - |
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| (adjective) of heaven or the spirit | Synonyms: celestial, ethereal |
| suppositional | (adjective) based primarily on surmise rather than adequate evidence | Synonyms: conjectural, divinatory, hypothetic, hypothetical, supposed, suppositious, supposititious |
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| supranational | (adjective) transcending established national boundaries or spheres of interest | - |
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| synchronal | (adjective) occurring or existing at the same time or having the same period or phase | Synonyms: synchronic, synchronous |
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| synclinal | (adjective) sloping downward toward each other to create a trough | - |
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| tensional | (adjective) of or relating to or produced by tension | - |
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| terminal | (adjective) being or situated at an end | Synonyms: endmost |
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| (adjective) relating to or occurring in a term or fixed period of time | - |
| (adjective) of or relating to or situated at the ends of a delivery route | - |
| (adjective) occurring at or forming an end or termination | Synonyms: concluding, final, last |
| (adjective) causing or ending in or approaching death | - |
| (noun) station where transport vehicles load or unload passengers or goods | Synonyms: depot, terminus |
| (noun) a contact on an electrical device (such as a battery) at which electric current enters or leaves | Synonyms: pole |
| (noun) electronic equipment consisting of a device providing access to a computer; has a keyboard and display | - |
| (noun) either extremity of something that has length | Synonyms: end |
| tetragonal | (adjective) of or relating to or shaped like a quadrilateral | - |
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| thenal | (adjective) of or relating to the palm of the hand or to the area at the base of the thumb | Synonyms: thenar |
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| tonal | (adjective) having tonality; i.e. tones and chords organized in relation to one tone such as a keynote or tonic | - |
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| (adjective) employing variations in pitch to distinguish meanings of otherwise similar words | Synonyms: tonic |
| traditional | (adjective) consisting of or derived from tradition | - |
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| (adjective) pertaining to time-honored orthodox doctrines | - |
| transitional | (adjective) of or relating to or characterized by transition | - |
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| translational | (adjective) of or relating to uniform movement without rotation | - |
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| transnational | (adjective) involving or operating in several nations or nationalities | Synonyms: multinational |
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| tribunal | (noun) an assembly (including one or more judges) to conduct judicial business | Synonyms: court, judicature |
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| trigeminal | (noun) the main sensory nerve of the face and motor nerve for the muscles of mastication | Synonyms: fifth cranial nerve, nervus trigeminus, trigeminal nerve, trigeminus |
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| trigonal | (adjective) having threefold symmetry | Synonyms: rhombohedral |
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| turbinal | (noun) any of the scrolled spongy bones of the nasal passages in man and other vertebrates | Synonyms: turbinate, turbinate bone |
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| unconditional | (adjective) not conditional | Synonyms: unconditioned |
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| (adjective) not contingent; not determined or influenced by someone or something else | - |
| (adjective) not modified or restricted by reservations | Synonyms: categoric, categorical, flat |
| unconstitutional | (adjective) not consistent with or according to a constitution; contrary to the U.S. Constitution | - |
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| unconventional | (adjective) not conforming to accepted rules or standards | - |
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| (adjective) not conventional or conformist | - |
| (adjective) not conforming to legality, moral law, or social convention | Synonyms: improper, unlawful |
| undenominational | (adjective) not bound or devoted to the promotion of a particular denomination | - |
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| unemotional | (adjective) unsusceptible to or destitute of or showing no emotion | - |
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| (adjective) cool and formal in manner | Synonyms: restrained, reticent |
| unexceptional | (adjective) not special in any way; lacking distinction | Synonyms: mine run, run-of-the-mill, run-of-the-mine, undistinguished |
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| unfunctional | (adjective) not related to or suitable for everyday needs or activities | - |
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| unidimensional | (adjective) relating to a single dimension or aspect; having no depth or scope | Synonyms: one-dimensional |
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| unidirectional | (adjective) operating or moving or allowing movement in one direction only | - |
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| uninominal | (adjective) based on the system of having only one member from each district (as of a legislature) | Synonyms: one-member |
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| unintentional | (adjective) done or made or performed with purpose and intent | Synonyms: designed, intentional |
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| (adjective) not done with purpose or intent | Synonyms: unplanned, unwitting |