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diamond (n.)

mid-14c., diamaunt, diamond, "extremely hard and refractive precious stone made of pure or nearly pure carbon," from Old French diamant, from Medieval Latin diamantem (nominative diamas), from Vulgar Latin *adiamantem (which was subsequently altered by influence of the many Greek words in dia-), from Latin adamantem (nominative adamans) "the hardest metal," later, "diamond," from Greek adamas (genitive adamantos), name of a hypothetical hardest material, noun use of an adjective meaning "unbreakable, inflexible," a word of uncertain origin (see adamant (n.)).

From early 15c. as "person of great worth" (a sense also in Latin). From late 15c. as "geometric figure of four equal straight lines forming two acute and two obtuse angles." From 1590s as "playing-card stamped with one or more red diamonds." In baseball, "square space enclosed within the four bases," is American English, by 1875. As an adjective "resembling, consisting of, or set with diamonds," from 1550s.

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Definitions of diamond from WordNet

diamond (n.)
a transparent piece of diamond that has been cut and polished and is valued as a precious gem;
diamond (n.)
very hard native crystalline carbon valued as a gem;
Synonyms: adamant
diamond (n.)
a parallelogram with four equal sides; an oblique-angled equilateral parallelogram;
Synonyms: rhombus / rhomb
diamond (n.)
a playing card in the minor suit that has one or more red rhombuses on it;
he led a small diamond
diamonds were trumps
diamond (n.)
the area of a baseball field that is enclosed by 3 bases and home plate;
Synonyms: baseball diamond / infield
diamond (n.)
the baseball playing field;
Synonyms: ball field / baseball field
From wordnet.princeton.edu