Etymology
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used (adj.)

"second-hand," 1590s, past-participle adjective from use (v.). To be used to "accustomed, familiar" is recorded by late 14c. Verbal phrase used to "formerly did or was" (as in I used to love her) represents a construction attested from c. 1300, and common from c. 1400, from use (intransitive) "be accustomed, practice customarily," but now surviving only in past tense form. The pronunciation is affected by the t- of to. Used-to-be (n.) "one who has outlived his fame" is from 1853.

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Definitions of used

used (adj.)
employed in accomplishing something; "the principle of surprise is the most used and misused of all the principles of war"- H.H.Arnold & I.C.Eaker;
used (adj.)
(of persons) taken advantage of;
after going out of his way to help his friend get the job he felt not appreciated but used
Synonyms: exploited / ill-used / put-upon / victimized / victimised
used (adj.)
previously used or owned by another;
bought a secondhand (or used) car
Synonyms: secondhand
From wordnet.princeton.edu