English Reference
noun · adjective

maximum

n. · adj.
US /ˈmæksəməm/ UK /mˈæksɪməm/ max·i·mum UK spelling maximums

  1. 01 B1 Intermediate

    n.the largest amount or highest level that is possible or allowed.

    n.the greatest quantity or degree reached or permitted.

    Simple

    The maximum number of people allowed in the lift is eight.

    In context

    The legal maximum for noise levels in residential areas is strictly enforced after ten o'clock at night.

    Usage

    Often used with 'of' followed by a plural noun.

  2. 02 B2 Upper Intermediate AcademicTechnical Math

    n.the largest value in a group of numbers or a graph.

    n.the greatest value of a set, sample, or mathematical function.

    Simple

    The graph shows a maximum at the point where the temperature was highest.

    In context

    To find the local maximum, the student had to calculate the first derivative of the function and solve for zero.

    Usage

    The plural can be either 'maximums' or the more formal 'maxima'.

    global maximumlocal maximum
  3. 03 C1 Advanced Informal Law

    n.a type of prison for the most dangerous criminals.

    n.a classification of prison facility designed for high-risk inmates requiring the highest level of control.

    Simple

    He was sentenced to twenty years in maximum for his crimes.

    In context

    After the attempted escape, the prisoner was transferred from a medium-security facility to maximum.

    Teacher's tip

    In this sense, 'maximum' is used as a shorthand noun for 'maximum security prison' in informal or journalistic contexts.

    high security
  4. 04 B1 Intermediate

    adj.being the largest amount or highest level possible.

    adj.denoting the greatest possible amount, degree, or intensity.

    Simple

    The car can reach a maximum speed of 120 miles per hour.

    In context

    The project requires maximum effort from every team member if we are to meet the deadline by Friday.

Usage maximum sentence · maximum file · maximum security

Please note, the maximum file size is 5.7 MB .

The Guardian· 14 Aug 2026

During the maximum solar activity cycle that comes every 11 years, there can be 10 or more in a single day.

BBC News· 14 Aug 2026

Via French from Latin maximum.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Latin maximum
Level B2 · Upper Intermediate
Frequency Common
Updated