| altar | (noun) a raised structure on which gifts or sacrifices to a god are made | - |
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| (noun) the table in Christian churches where communion is given | Synonyms: communion table, Lord's table |
| altarpiece | (noun) a painted or carved screen placed above and behind an altar or communion table | Synonyms: reredos |
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| altazimuth | (noun) an instrument that measures the altitude and azimuth of celestial bodies; used in navigation | - |
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| altcoin | (noun) an alternative cryptocurrency | - |
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| alter | (verb) remove the ovaries of | Synonyms: castrate, neuter, spay |
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| (verb) become different in some particular way, without permanently losing one's or its former characteristics or essence | Synonyms: change, vary |
| (verb) cause to change; make different; cause a transformation | Synonyms: change, modify |
| (verb) insert words into texts, often falsifying it thereby | Synonyms: falsify, interpolate |
| (verb) make an alteration to | - |
| alterability | (noun) the quality of being alterable | - |
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| alterable | (adjective) capable of being changed or altered in some characteristic | - |
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| (adjective) (of the punishment ordered by a court) capable of being changed to one less severe | - |
| alteration | (noun) the act of revising or altering (involving reconsideration and modification) | Synonyms: revision |
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| (noun) the act of making something different (as e.g. the size of a garment) | Synonyms: adjustment, modification |
| (noun) an event that occurs when something passes from one state or phase to another | Synonyms: change, modification |
| alterative | (adjective) tending to cure or restore to health | Synonyms: curative, healing, remedial, sanative, therapeutic |
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| altercate | (verb) have a disagreement over something | Synonyms: argufy, dispute, quarrel, scrap |
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| altercation | (noun) noisy quarrel | Synonyms: affray, fracas |
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| altered | (adjective) changed in form or character without becoming something else | - |
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| (adjective) having testicles or ovaries removed | Synonyms: neutered |
| (adjective) changed in order to improve or made more fit for a particular purpose | Synonyms: adapted |
| altering | (noun) the sterilization of an animal | Synonyms: fixing, neutering |
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| alternate | (adjective) of leaves and branches etc; first on one side and then on the other in two ranks along an axis; not paired | - |
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| (adjective) serving or used in place of another | Synonyms: alternative, substitute |
| (adjective) occurring by turns; first one and then the other | Synonyms: alternating |
| (adjective) every second one of a series | - |
| (noun) someone who takes the place of another person | Synonyms: replacement, surrogate |
| (verb) do something in turns | Synonyms: take turns |
| (verb) go back and forth; swing back and forth between two states or conditions | Synonyms: jump |
| (verb) reverse (a direction, attitude, or course of action) | Synonyms: flip-flop, flip, interchange, switch, tack |
| (verb) be an understudy or alternate for a role | Synonyms: understudy |
| (verb) exchange people temporarily to fulfill certain jobs and functions | - |
| alternately | (adverb) in an alternating sequence or position | - |
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| alternating | (adjective) (of a current) reversing direction | - |
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| (adjective) occurring by turns; first one and then the other | Synonyms: alternate |
| alternation | (noun) successive change from one thing or state to another and back again | - |
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| alternative | (adjective) necessitating a choice between mutually exclusive possibilities | - |
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| (adjective) serving or used in place of another | Synonyms: alternate, substitute |
| (adjective) pertaining to unconventional choices | - |
| (noun) one of a number of things from which only one can be chosen | Synonyms: choice, option |
| alternatively | (adverb) in place of, or as an alternative to | Synonyms: instead, or else |
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| alternator | (noun) an old term for an electric generator that produces alternating current (especially in automobiles) | - |
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| althaea | (noun) any of various plants of the genus Althaea; similar to but having smaller flowers than genus Alcea | Synonyms: althea, hollyhock |
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| althea | (noun) any of various plants of the genus Althaea; similar to but having smaller flowers than genus Alcea | Synonyms: althaea, hollyhock |
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| altimeter | (noun) an instrument that measures the height above ground; used in navigation | - |
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| altissimo | (adjective) very high | - |
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| altitude | (noun) elevation especially above sea level or above the earth's surface | Synonyms: height |
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| (noun) angular distance above the horizon (especially of a celestial object) | Synonyms: ALT, EL, elevation |
| (noun) the perpendicular distance from the base of a geometric figure to the opposite vertex (or side if parallel) | - |
| altitudinal | (adjective) pertaining to altitude | - |
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| altitudinous | (adjective) indefinitely high; lofty | - |
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| alto | (adjective) (of a musical instrument) second highest member of a group | - |
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| (adjective) of or being the highest male voice; having a range above that of tenor | Synonyms: countertenor |
| (adjective) of or being the lowest female voice | Synonyms: contralto |
| (noun) the pitch range of the lowest female voice | - |
| (noun) (of a musical instrument) the second highest instrument in a family of musical instruments | - |
| (noun) the lowest female singing voice | Synonyms: contralto |
| (noun) the highest adult male singing voice | Synonyms: countertenor |
| (noun) a singer whose voice lies in the alto clef | - |
| altocumulus | (noun) a cumulus cloud at an intermediate altitude of 2 or 3 miles | Synonyms: altocumulus cloud |
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| altogether | (noun) informal terms for nakedness | Synonyms: birthday suit, raw |
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| (adverb) with everything included or counted | Synonyms: all told, in all |
| (adverb) with everything considered (and neglecting details) | Synonyms: all in all, on the whole, tout ensemble |
| (adverb) to a complete degree or to the full or entire extent; Completely or entirely | Synonyms: all, completely, entirely, right, totally, whole, wholly |
| altoist | (noun) a musician who plays the alto saxophone | Synonyms: alto saxophonist |
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| altostratus | (noun) a stratus cloud at an intermediate altitude of 2 or 3 miles | Synonyms: altostratus cloud |
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| altricial | (adjective) (of hatchlings) naked and blind and dependent on parents for food | - |
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| altruism | (noun) the quality of unselfish concern for the welfare of others | Synonyms: selflessness |
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| altruist | (noun) someone who makes charitable donations intended to increase human well-being | Synonyms: philanthropist |
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| altruistic | (adjective) showing unselfish concern for the welfare of others | Synonyms: selfless |
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| altruistically | (adverb) in an altruistic manner | Synonyms: selflessly |
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