Both a noun and an adjective, maximum takes it to the max: it means the most, the fastest, the biggest.

"The most you can have is the maximum": that's the noun. In "the maximum amount is the most you can have," it's used as an adjective. You might be familiar with the shortened version of the word: the "max." If you take something "to the max," you're doing as much of it as possible. You take it to the limit. You take it to the maximum.

Definitions of maximum
  1. adjective
    the greatest or most complete or best possible
    maximum pressure”
    synonyms: maximal
    greatest or maximal in degree; extreme
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    minimal, minimum
    the least possible
    borderline, marginal
    of questionable or minimal quality
    so small as to be meaningless; insignificant
    nominal, token, tokenish
    insignificantly small; a matter of form only (`tokenish' is informal)
    stripped, stripped-down
    having only essential or minimal features
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  2. noun
    the largest possible quantity
    synonyms: upper limit
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    lower limit, minimum
    the smallest possible quantity
    type of:
    extremum, peak
    the most extreme possible amount or value
    large indefinite amount, large indefinite quantity
    an indefinite quantity that is above the average in size or magnitude
  3. noun
    the greatest possible degree
    synonyms: level best, utmost, uttermost
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    type of:
    bound, boundary, limit
    the greatest possible degree of something
  4. noun
    the point on a curve where the tangent changes from positive on the left to negative on the right
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    the point on a curve where the tangent changes from negative on the left to positive on the right
    type of:
    as far as something can go
Word Family

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