If something is used, that means it has been owned by someone else. If you buy used textbooks, that means they’re not new — someone else owned them and read them before you did.

If you sell used cars, that means you’re selling cars that have already had at least one owner. Used can also describe things that have already served their purpose. Used batteries aren't good anymore: their power has been used up. People can also be used, and in this sense the word means “taken advantage of.” You might feel used by your neighbor if she's only nice to you when she needs you to water her plants.

Definitions of used
  1. adjective
    previously used or owned by another
    synonyms: secondhand
    of long duration; not new
  2. adjective
    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”
    in use
    currently being used
    utilised, utilized
    put to use
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    used incorrectly or carelessly or for an improper purpose
    used improperly or excessively especially drugs
    exploited, ill-used, put-upon, used, victimised, victimized
    of persons; taken advantage of
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  3. adjective
    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, victimised, victimized
    used incorrectly or carelessly or for an improper purpose
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