| 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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| alula | (noun) tuft of small stiff feathers on the first digit of a bird's wing | Synonyms: bastard wing, spurious wing |
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| (noun) scalelike structure between the base of the wing and the halter of a two-winged fly | Synonyms: calypter |
| alular | (adjective) pertaining to alulae | - |
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| alum | (noun) a double sulphate of aluminum and potassium that is used as an astringent (among other things) | - |
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| (noun) a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum | Synonyms: potash alum, potassium alum |
| (noun) a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum | Synonyms: ammonia alum, ammonium alum |
| (noun) a person who has received a degree from a school (high school or college or university) | Synonyms: grad, graduate |
| alumbloom | (noun) any of several herbs of the genus Heuchera | Synonyms: alumroot |
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| alumina | (noun) any of various forms of aluminum oxide occurring naturally as corundum | Synonyms: aluminium oxide, aluminum oxide |
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| aluminate | (noun) a compound of alumina and a metallic oxide | - |
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| aluminiferous | (adjective) containing alum or aluminum | - |
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| aluminise | (verb) cover with aluminum | Synonyms: aluminize |
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| aluminium | (noun) a silvery ductile metallic element found primarily in bauxite | Synonyms: Al, aluminum, atomic number 13 |
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| aluminize | (verb) cover with aluminum | Synonyms: aluminise |
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| aluminous | (adjective) pertaining to or containing aluminum or alum | - |
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| aluminum | (noun) a silvery ductile metallic element found primarily in bauxite | Synonyms: Al, aluminium, atomic number 13 |
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| alumna | (noun) a female person who has received a degree from a school (high school or college or university) | - |
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| alumnus | (noun) a male person who has received a degree from a school (high school or college or university) | - |
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| alumroot | (noun) any of several herbs of the genus Heuchera | Synonyms: alumbloom |
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| alundum | (noun) a substance made of fused alumina | - |
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| alveolar | (adjective) pertaining to the tiny air sacs of the lungs | - |
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| (adjective) pertaining to the sockets of the teeth or that part of the upper jaw | - |
| (noun) a consonant articulated with the tip of the tongue near the gum ridge | Synonyms: alveolar consonant, dental, dental consonant |
| alveolate | (adjective) pitted with cell-like cavities (as a honeycomb) | Synonyms: cavitied, faveolate, honeycombed, pitted |
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| alveolitis | (noun) inflammation of the alveoli in the lungs caused by inhaling dust; with repeated exposure the condition may become chronic | - |
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| (noun) inflammation in the socket of a tooth; sometimes occurs after a tooth is extracted and a blood clot fails to form | Synonyms: dry socket |
| alveolus | (noun) a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways | Synonyms: air cell, air sac |
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| (noun) a bony socket in the alveolar ridge that holds a tooth | Synonyms: tooth socket |
| alvine | (adjective) of or relating to the intestines | - |
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| always | (adverb) at all times; all the time and on every occasion | Synonyms: e'er, ever |
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| (adverb) forever; throughout all time | - |
| (adverb) at any time or in any event | - |
| (adverb) invariably | Synonyms: constantly, forever, incessantly, perpetually |
| (adverb) without variation or change, in every case | Synonyms: constantly, invariably |
| alyssum | (noun) any garden plant of the genus Alyssum having clusters of small yellow or white flowers | Synonyms: madwort |
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