ALPHAの定義と意味 - メリアム・ウェブスター

ALPHA Definition & Meaning - Merriam-Webster Est. 1828 Dictionary Definition noun adjective noun 2 noun adjective Synonyms Example Sentences Word History Phrases Containing Rhymes Entries Near Related Articles Cite this Entry Citation Kids Definition Kids Medical Definition Medical Show more Show more Citation Kids Medical Save Word To save this word, you'll need to log in. Log In alpha 1 of 2 noun al·​pha ˈal-fə plural alphas Synonyms of alpha 1 : the 1st letter of the Greek alphabet see Alphabet Table 2 a : something that is first : beginning compare omega see also alpha and omega b : something or someone designated with the name alpha or the Greek letter α especially denoting the first in position, order, or class 3 : alpha wave 4 : alpha particle 5 : the first version of a product (such as a computer program) that is being developed and tested — usually used before another noun alpha versions alpha testing also : a stage of product development in which alpha prototypes are released a product that is available in alpha compare beta entry 1 sense 3 6 : a socially dominant person or animal Mike is the ringleader, the alpha of the group. Tom is his wingman … — Jason Blake [Kamala] Harris came with a clear plan, was well prepared, and executed perfectly. The fact that she was willing to take on Biden, the front-runner, signaled that she was the alpha on the stage. — Philip Klein The rest of the animals hold positions in the pecking order below the alphas and respect their leadership roles, although they may challenge other wolves (even alphas ) to raise their rank. — C. C. Holland compare sigma , beta entry 1 sense 2b alpha 2 of 2 adjective 1 : closest in the structure of an organic molecule to a particular group or atom — symbol α α-substitution 2 : socially dominant especially in a group of animals an alpha male 3 : alphabetic Synonyms of alpha Relevance Noun beginning start onset inception launch commencement See All Synonyms & Antonyms in Thesaurus Examples of alpha in a Sentence Noun money is not the alpha and omega—the beginning and end—of life's purpose Recent Examples on the Web Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback . Noun So do moisturizers containing lactic acid and anti-aging products with alpha -hydroxy acids. — Ryan Brennan may 1, Sacbee.com , 1 May 2026 In one case, while redesigning a ribosomal protein called RpsJ, the AI remodeled an alpha helix—a structural element bridging different parts of the ribosome—and introduced eight new nearby mutations to compensate for the substitution of just two isoleucines. — Jacek Krywko, Scientific American , 30 Apr. 2026 Adjective The study tracked measurable, concrete advantages that came with his alpha status at Willowbank Wildlife Reserve. — Samantha Agate, Miami Herald , 22 Apr. 2026 The other case concerned an old Japanese macaque whose ability to walk gradually deteriorated; the macaque maintained his alpha status by allying with the alpha female. — ArsTechnica , 20 Apr. 2026 See All Example Sentences for alpha Word History Etymology Noun Middle English, from Latin, from Greek, of Semitic origin; akin to Hebrew āleph aleph Adjective (sense 2) from attributive use of alpha entry 1 ; (sense 3) by shortening First Known Use Noun 12th century, in the meaning defined at sense 1 Adjective 1842, in the meaning defined at sense 1 Time Traveler The first known use of alpha was in the 12th century See more words from the same century Phrases Containing alpha alpha - adrenergic alpha and omega alpha - fetoprotein alpha globulin alpha - helix alpha - hydroxy acid alpha interferon alpha iron alpha male alpha particle alpha privative alpha - receptor alpha test alpha - tocopherol alpha wave interferon alpha the alpha and omega Rhymes for alpha alfa alfalfa See All Rhymes for alpha Browse Nearby Words alpestrine alpha alpha-adrenergic See all Nearby Words Articles Related to alpha Gen Alpha the generation of people born (approximately) between 2010 and 2025 How the Greeks Influenced Our Alphabet An excerpt from 'Greek to Me' by Mary Norris Going Greek: 7 Words from the Greek... When English borrows from another alphabet Cite this Entry Style MLA Chicago APA Merriam-Webster “Alpha.” Merriam-Webster.com Dictionary , Merriam-Webster, https://www.merriam-webster.com/dictionary/alpha. Accessed 6 May. 2026. Copy Citation Kids Definition alpha noun al·​pha ˈal-fə 1 : the first letter of the Greek alphabet — A or α 2 : something that is first : beginning Medical Definition alpha 1 of 2 noun al·​pha ˈal-fə 1 : the 1st letter of the Greek alphabet — symbol Α or α 2 : alpha particle 3 : alpha wave alpha 2 of 2 adjective variants or α- 1 : of or relating to one of two or more closely related chemical substances the alpha chain of hemoglobin α-yohimbine — used somewhat arbitrarily to specify ordinal relationship or a particular physical form, especially one that is allotropic, isomeric, stereoisomeric, or sometimes polymeric (as in α-D-glucose) 2 : closest in position in the structure of an organic molecule to a particular group or atom also : occurring at or having a structure characterized by such a position α-substitution Last Updated: 2 May 2026 - Updated example sentences Love words? Need even more definitions? 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