Meaning of “maximum” - Learner’s Dictionary

maximum

adjective [ always before noun ] us uk /ˈmæksɪməm/
Extra Examples
The lake reaches a maximum depth of 292 metres.The maximum output of the amplifier is 35 watts.The car reached a maximum speed of 130 miles per hour.He is in a maximum security prison.She received a maximum score from the judges.

B1 The maximum amount of something is the largest amount that is allowed or possible:

the maximum temperature/speed
→ Opposite minimum adjective

(Definition of “maximum adjective” from the Cambridge Learner’s Dictionary © Cambridge University Press)