Something altered is changed. Your recently altered appearance, including a new short haircut and stylish new clothes, might surprise your grandparents when they pick you up at the airport.

Altered is an adjective that describes anything that's been changed or modified. You might need altered clothing after you succeed at your diet, or feel like you are in an "altered state" after you've been hypnotized. Altered behavior is behavior you have changed, like the altered habits of your housebroken dog. Altered comes from the Medieval Latin alterare, or "to change."

Definitions of altered
  1. adjective
    changed in form or character without becoming something else
    “the altered policy promised success”
    “following an altered course we soon found ourselves back in civilization”
    “"he looked...with clouded eyes and with an altered manner of breathing"- Charles Dickens”
    (especially of garments) having the fit or style adjusted
    made or become different in some respect
    edited, emended
    improved or corrected by critical editing
    altered by paraphrasing
    improved or brought up to date
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    unaltered, unchanged
    remaining in an original state
    dateless, timeless
    unaffected by time
    in-situ, unmoved
    being in the original position; not having been moved
    not changed by editing
    not altered by reduction
    not improved or brought up to date
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  2. adjective
    changed in order to improve or made more fit for a particular purpose
    “instructions altered to suit the children's different ages”
    synonyms: adapted
    changed in form or character
  3. adjective
    having testicles or ovaries removed
    synonyms: neutered
    castrated, unsexed
    deprived of sexual capacity or sexual attributes
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