| abecedarian | (adjective) alphabetically arranged (as for beginning readers) | - |
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| (noun) a novice learning the rudiments of some subject | - |
| abecedarius | (noun) a poem having lines beginning with letters of the alphabet in regular order | - |
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| abidance | (noun) the act of abiding (enduring without yielding) | - |
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| (noun) the act of dwelling in a place | Synonyms: residence, residency |
| (noun) acting according to certain accepted standards | Synonyms: compliance, conformation, conformity |
| abracadabra | (noun) gibberish and nonsense | - |
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| abradant | (noun) a tool or machine used for wearing down or smoothing or polishing | Synonyms: abrader |
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| (noun) a substance that abrades or wears down | Synonyms: abrasive, abrasive material |
| abundance | (noun) the property of a more than adequate quantity or supply | Synonyms: copiousness, teemingness |
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| (noun) (chemistry) the ratio of the total mass of an element in the earth's crust to the total mass of the earth's crust; expressed as a percentage or in parts per million | - |
| (noun) (physics) the ratio of the number of atoms of a specific isotope of an element to the total number of isotopes present | - |
| abundant | (adjective) present in great quantity | - |
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| abundantly | (adverb) in an abundant manner | Synonyms: copiously, extravagantly, profusely |
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| acaudal | (adjective) lacking a tail or taillike appendage | Synonyms: acaudate |
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| acaudate | (adjective) lacking a tail or taillike appendage | Synonyms: acaudal |
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| accommodate | (verb) make fit for, or change to suit a new purpose | Synonyms: adapt |
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| (verb) make (one thing) compatible with (another) | Synonyms: conciliate, reconcile |
| (verb) provide a service or favor for someone | Synonyms: oblige |
| (verb) provide with something desired or needed | - |
| (verb) be agreeable or acceptable to | Synonyms: fit, suit |
| (verb) provide housing for | Synonyms: lodge |
| (verb) have room for; hold without crowding | Synonyms: admit, hold |
| accommodating | (adjective) helpful in bringing about a harmonious adaptation | Synonyms: accommodative |
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| (adjective) obliging; willing to do favors | - |
| accommodatingly | (adverb) in accommodation | Synonyms: obligingly |
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| accommodation | (noun) the act of providing something (lodging or seat or food) to meet a need | - |
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| (noun) (physiology) the automatic adjustment in focal length of the natural lens of the eye | - |
| (noun) living quarters provided for public convenience | - |
| (noun) in the theories of Jean Piaget: the modification of internal representations in order to accommodate a changing knowledge of reality | - |
| (noun) a settlement of differences | - |
| (noun) making or becoming suitable; adjusting to circumstances | Synonyms: adjustment, fitting |
| accommodational | (adjective) of or relating to the accommodation of the lens of the eye | - |
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| accommodative | (adjective) helpful in bringing about a harmonious adaptation | Synonyms: accommodating |
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| (adjective) tending to reconcile or accommodate; bringing into harmony | Synonyms: reconciling |
| (adjective) willing to adjust to differences in order to obtain agreement | Synonyms: cooperative |
| accommodator | (noun) someone who performs a service or does a favor | Synonyms: obliger |
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| accordance | (noun) the act of granting rights | Synonyms: accordance of rights |
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| (noun) concurrence of opinion | Synonyms: accord, conformity |
| accordant | (adjective) being in agreement or harmony; often followed by `with' | - |
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| (adjective) in keeping | Synonyms: agreeable, concordant, conformable, consonant |
| adactylia | (noun) congenital absence of fingers and/or toes | Synonyms: adactylism, adactyly |
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| adactylism | (noun) congenital absence of fingers and/or toes | Synonyms: adactylia, adactyly |
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| adactylous | (adjective) without fingers and/or toes | - |
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| adactyly | (noun) congenital absence of fingers and/or toes | Synonyms: adactylia, adactylism |
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| adage | (noun) a condensed but memorable saying embodying some important fact of experience that is taken as true by many people | Synonyms: byword, proverb, saw |
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| adagio | (adjective) (of tempo) leisurely | - |
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| (noun) a slow section of a pas de deux requiring great skill and strength by the dancers | - |
| (noun) (music) a composition played in adagio tempo (slowly and gracefully) | - |
| (adverb) slowly | - |
| adamance | (noun) resoluteness by virtue of being unyielding and inflexible | Synonyms: obduracy, unyieldingness |
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| adamant | (adjective) impervious to pleas, persuasion, requests, reason | Synonyms: adamantine, inexorable, intransigent |
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| (noun) very hard native crystalline carbon valued as a gem | Synonyms: diamond |
| adamantine | (adjective) consisting of or having the hardness of adamant | - |
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| (adjective) having the hardness of a diamond | - |
| (adjective) impervious to pleas, persuasion, requests, reason | Synonyms: adamant, inexorable, intransigent |
| adamantly | (adverb) inflexibly; unshakably | - |
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| adapt | (verb) make fit for, or change to suit a new purpose | Synonyms: accommodate |
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| (verb) adapt or conform oneself to new or different conditions | Synonyms: adjust, conform |
| adaptability | (noun) the ability to change (or be changed) to fit changed circumstances | - |
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| adaptable | (adjective) capable of adapting (of becoming or being made suitable) to a particular situation or use | - |
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| adaptation | (noun) (physiology) the responsive adjustment of a sense organ (as the eye) to varying conditions (as of light) | - |
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| (noun) a written work (as a novel) that has been recast in a new form | Synonyms: version |
| (noun) the process of adapting to something (such as environmental conditions) | Synonyms: adaption, adjustment |
| adaptational | (adjective) of or relating to adaptation | - |
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| adaptative | (adjective) having a capacity for adaptation | Synonyms: adaptive |
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| adapted | (adjective) changed in order to improve or made more fit for a particular purpose | Synonyms: altered |
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| adapter | (noun) device that enables something to be used in a way different from that for which it was intended or makes different pieces of apparatus compatible | Synonyms: adaptor |
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| (noun) a musician who adapts a composition for particular voices or instruments or for another style of performance | Synonyms: arranger, transcriber |
| adaption | (noun) the process of adapting to something (such as environmental conditions) | Synonyms: adaptation, adjustment |
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| adaptive | (adjective) having a capacity for adaptation | Synonyms: adaptative |
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| adaptor | (noun) device that enables something to be used in a way different from that for which it was intended or makes different pieces of apparatus compatible | Synonyms: adapter |
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| adaxial | (adjective) nearest to or facing toward the axis of an organ or organism | Synonyms: ventral |
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| adaxially | (adverb) in an adaxial manner | - |
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| addable | (adjective) capable of being added or added to | Synonyms: addible |
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| addax | (noun) large antelope with lightly spiraled horns of desert regions of northern Africa | Synonyms: Addax nasomaculatus |
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| adenoidal | (adjective) of or pertaining to the adenoids | - |
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| (adjective) sounding as if the nose were pinched | Synonyms: nasal, pinched |
| affidavit | (noun) written declaration made under oath; a written statement sworn to be true before someone legally authorized to administer an oath | - |
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| affordable | (adjective) that you have the financial means for | Synonyms: low-cost, low-priced |
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| afterdamp | (noun) a toxic mixture of gases (including carbon dioxide and carbon monoxide and nitrogen) after an explosion of firedamp in a mine | - |
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| agenda | (noun) a temporally organized plan for matters to be attended to | Synonyms: docket, schedule |
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| (noun) a list of matters to be taken up (as at a meeting) | Synonyms: agendum, order of business |
| agonadal | (adjective) lacking gonads | - |
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| alidad | (noun) surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles | Synonyms: alidade |
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| (noun) surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments | Synonyms: alidade |
| alidade | (noun) surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles | Synonyms: alidad |
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| (noun) surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments | Synonyms: alidad |
| alkaloidal | (adjective) pertaining to or consisting of alkaloids | - |
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| allamanda | (noun) a plant of the genus Allamanda having large showy funnel-shaped flowers in terminal cymes | - |
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| amadavat | (noun) red Asian weaverbirds often kept as cage birds | Synonyms: avadavat |
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| amendable | (adjective) capable of being corrected by additions | Synonyms: correctable |
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| amendatory | (adjective) effecting amendment | - |
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| amiodarone | (noun) an antiarrhythmic drug (trade name Cordarone) that has potentially fatal side effects and is used to control serious heart rhythm problems only when safer agents have been ineffective | Synonyms: Cordarone |
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| amygdala | (noun) an almond-shaped neural structure in the anterior part of the temporal lobe of the cerebrum; intimately connected with the hypothalamus and the hippocampus and the cingulate gyrus; as part of the limbic system it plays an important role in motivation and emotional behavior | Synonyms: amygdaloid nucleus, corpus amygdaloideum |
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| amygdaliform | (adjective) shaped like an almond | Synonyms: almond-shaped, amygdaloid, amygdaloidal |
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| amygdalin | (noun) a bitter cyanogenic glucoside extracted from the seeds of apricots and plums and bitter almonds | - |
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| amygdaline | (adjective) related to or resembling an almond | - |
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| amygdaloid | (adjective) shaped like an almond | Synonyms: almond-shaped, amygdaliform, amygdaloidal |
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| (noun) volcanic rock in which rounded cavities formed by expanding gas have subsequently become filled with mineral deposits | - |
| amygdaloidal | (adjective) shaped like an almond | Synonyms: almond-shaped, amygdaliform, amygdaloid |
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| amygdalotomy | (noun) psychosurgery in which amygdaloid fibers that mediate limbic system activity are severed (in cases of extreme uncontrollable violence) | - |
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| amyloidal | (adjective) resembling starch | Synonyms: amylaceous, amyloid, farinaceous, starchlike |
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| anaconda | (noun) large arboreal boa of tropical South America | Synonyms: Eunectes murinus |
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| andante | (adjective) (of tempo) moderately slow | - |
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| (noun) a musical composition or musical passage to be performed moderately slow | - |
| (noun) a moderately slow tempo (a walking pace) | - |
| (adverb) at a moderately slow tempo | - |
| andantino | (adjective) (of tempo) moderately fast | - |
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| andromeda | (noun) any of several shrubs of the genus Andromeda having leathery leaves and clusters of small flowers | - |
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| (noun) broad-leaved evergreen Asiatic shrub with glossy leaves and drooping clusters of white flowers | Synonyms: Japanese andromeda, lily-of-the-valley tree, Pieris japonica |
| annelidan | (adjective) relating to or belonging to or characteristic of any worms of the phylum Annelida | Synonyms: annelid |
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| anodal | (adjective) of or at or relating to an anode | Synonyms: anodic |
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| antedate | (verb) establish something as being earlier relative to something else | Synonyms: foredate, predate |
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| (verb) be earlier in time; go back further | Synonyms: antecede, forego, forgo, precede, predate |
| anthropoidal | (adjective) resembling apes | Synonyms: anthropoid, apelike |
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| antioxidant | (noun) substance that inhibits oxidation or inhibits reactions promoted by oxygen or peroxides | - |
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| antipodal | (adjective) relating to the antipodes or situated at opposite sides of the earth | Synonyms: antipodean |
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| (noun) the relation of opposition along a diameter | Synonyms: antipodal opposition, diametrical opposition |
| aoudad | (noun) wild sheep of northern Africa | Synonyms: Ammotragus lervia, arui, audad, Barbary sheep, maned sheep |
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| apadana | (noun) the great hall in ancient Persian palaces | - |
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| apodal | (adjective) (of snakes and eels) naturally footless | Synonyms: apodous |
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| appendage | (noun) a part that is joined to something larger | - |
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| (noun) an external body part that projects from the body | Synonyms: extremity, member |
| (noun) a natural prolongation or projection from a part of an organism either animal or plant | Synonyms: outgrowth, process |
| appendaged | (adjective) having an appendage | - |
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| appendant | (adjective) affixed as an appendage | - |
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| applaudable | (adjective) worthy of high praise | Synonyms: commendable, laudable, praiseworthy |
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| apsidal | (adjective) of or relating to an apse | - |
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| araneidal | (adjective) relating to or resembling a spider | Synonyms: araneidan |
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| araneidan | (adjective) relating to or resembling a spider | Synonyms: araneidal |
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| armada | (noun) a large fleet | - |
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| arthropodal | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodan, arthropodous |
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| arthropodan | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodal, arthropodous |
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| artiodactyl | (adjective) of or relating to or belonging to mammals of the order Artiodactyla | Synonyms: artiodactylous, even-toed |
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| (noun) placental mammal having hooves with an even number of functional toes on each foot | Synonyms: artiodactyl mammal, even-toed ungulate |
| artiodactylous | (adjective) of or relating to or belonging to mammals of the order Artiodactyla | Synonyms: artiodactyl, even-toed |
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| asafetida | (noun) the brownish gum resin of various plants; has strong taste and odor; formerly used as an antispasmodic | Synonyms: asafoetida |
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| asafoetida | (noun) the brownish gum resin of various plants; has strong taste and odor; formerly used as an antispasmodic | Synonyms: asafetida |
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| ascendable | (adjective) capable of being ascended | Synonyms: ascendible, climbable |
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| ascendance | (noun) the state that exists when one person or group has power over another | Synonyms: ascendancy, ascendence, ascendency, control, dominance |
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| ascendancy | (noun) the state that exists when one person or group has power over another | Synonyms: ascendance, ascendence, ascendency, control, dominance |
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| ascendant | (adjective) tending or directed upward | Synonyms: ascendent, ascensive |
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| (adjective) most powerful or important or influential | Synonyms: ascendent, dominating |
| (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: ancestor, antecedent, ascendent, root |
| (noun) position or state of being dominant or in control | Synonyms: ascendent |
| asclepiadaceous | (adjective) of or relating to plants of the milkweed family | - |
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| asteroidal | (adjective) of or relating to or resembling an asteroid | - |
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| attendance | (noun) the act of being present (at a meeting or event etc.) | Synonyms: attending |
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| (noun) the number of people that are present | - |
| (noun) the frequency with which a person is present | - |