noun
max; maximum
Used as a noun to refer to the upper limit or highest value of something. Often appears in compounds like マックス値 (maximum value) or マックスまで (up to the max).
See also: マキシマム
このエアコンのマックスは30度だ。
The maximum setting on this air conditioner is 30 degrees.
音量をマックスにしない
Please don't turn the volume up to the max.
adverb
to the max; at most
Colloquial adverbial use meaning 'at most' or 'to the fullest extent'. Often used in casual speech to emphasize a limit or extreme degree.
この仕事はマックスで一週間かかる。
This job will take a week at most.
今日はマックスで10人しか来なかった。
Only 10 people came today, at most.