Something that is perfect is complete and without defect or blemish. It might also be precisely accurate or exact.

The word perfect can also be used as a verb meaning — you guessed it! — to make something perfect. (Note, though, the pronunciation difference: PER-fect as a noun; per-FECT as a verb.) It originally comes from the Latin word perficere, which breaks down into per- ("completely") and facere ("do"). As a noun perfect is a grammatical term referring to a tense of verbs describing an action that has been completed.

Definitions of perfect
  1. adjective
    being complete of its kind and without defect or blemish
    “a perfect circle”
    “a perfect reproduction”
    perfect happiness”
    perfect manners”
    “a perfect specimen”
    “a perfect day”
    unblemished, unmarred, unmutilated
    free from physical or moral spots or stains
    not broken; whole and intact; in one piece
    marked by strict and particular and complete accordance with fact
    (of a record) having no marks of discredit or offense
    free from flaw or blemish or impurity
    marked by errorless familiarity
    complete, consummate
    perfect and complete in every respect; having all necessary qualities
    down, down pat, mastered
    understood perfectly
    free from error
    faultless, immaculate, impeccable
    without fault or error
    flawless, unflawed
    without a flaw
    conforming to an ultimate standard of perfection or excellence; embodying an ideal
    idealised, idealized
    exalted to an ideal perfection or excellence
    excellent and delightful in all respects
    as if new
    capable of becoming or being made perfect
    more than perfect
    uncorrupted, undefiled
    (of language) not having its purity or excellence debased
    characterized by or aspiring to impracticable perfection
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    not perfect; defective or inadequate
    marred by imperfections
    physically and forcibly separated into pieces or cracked or split
    blemished, flawed
    having a blemish or flaw
    imperfectly spoken or written
    corrupt, corrupted
    containing errors or alterations
    defective, faulty
    having a defect
    capable of being made imperfect
    falling below the manufacturer's standard
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  2. adjective
    precisely accurate or exact
    perfect timing”
    marked by strict and particular and complete accordance with fact
  3. verb
    make perfect or complete
    perfect your French in Paris!”
    synonyms: hone
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    optimise, optimize
    make optimal; get the most out of; use best
    brush up, burnish, polish, polish up, round, round off
    bring to a highly developed, finished, or refined state
    type of:
    ameliorate, amend, better, improve, meliorate
    make better
  4. adjective
    without qualification; used informally as (often pejorative) intensifiers
    “a perfect idiot”
    synonyms: arrant, complete, consummate, double-dyed, everlasting, gross, pure, sodding, staring, stark, thoroughgoing, unadulterated, utter
    not diminished or moderated in intensity or severity; sometimes used as an intensifier
  5. noun
    a tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect)
    synonyms: perfect tense, perfective, perfective tense
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    present perfect, present perfect tense
    a perfective tense used to express action completed in the present
    past perfect, past perfect tense, pluperfect, pluperfect tense
    a perfective tense used to express action completed in the past
    future perfect, future perfect tense
    a perfective tense used to describe action that will be completed in the future
    type of:
    a grammatical category of verbs used to express distinctions of time
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