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Definition of sex noun from the Oxford Advanced Learner's Dictionary

sex

noun
 
/seks/
 
/seks/
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  1. [uncountable, countable] the state of being male or female
    • How can you tell what sex a fish is?
    • sex of somebody/something a process that enables couples to know the sex of their baby
    • We determined the sex of the birds from their DNA.
    • Please indicate your sex and date of birth below.
    • Levels of infection vary dramatically according to age and sex.
    • discrimination on grounds of race or sex
    • sex discrimination (= the act of treating men and women differently in an unfair way)
    • Testosterone is the male sex hormone.
    • In some areas the male : female sex ratio has reached 130 : 100.
    • Trying to prove that sex differences in behaviour are innate is controversial.
    compare gender
    Extra Examples
    • discrimination on grounds of sex
    • The word ‘man’ can refer to all humans, irrespective of sex.
    • Their gender identity does not match their biological sex at birth.
    • I wanted to change my sex.
    • issues of sex equality in the office
    • The theory predicts sex differences in the brain.
    Oxford Collocations Dictionaryadjective
    • female
    • male
    • opposite
    verb + sex
    • determine
    • change
    • be attracted to
    sex + noun
    • change
    • equality
    • discrimination
    preposition
    • between the sexes
    phrases
    • the battle of the sexes
    • equality between the sexes
    • equality of the sexes
    See full entry
  2. [countable] either of the two groups that people, animals, and plants are divided into according to their function of producing young
    • a member of the opposite sex
    • people of the same sex
    • single-sex schools
    • differences between the sexes
    • Exam results for both sexes have continued to improve.
    • Gibson was the first African American of either sex to play at Wimbledon.
    • the battle of the sexes (= the competitive relationship that exists between men and women)
    see also fair sex, same-sex
    Oxford Collocations Dictionaryadjective
    • female
    • male
    • opposite
    verb + sex
    • determine
    • change
    • be attracted to
    sex + noun
    • change
    • equality
    • discrimination
    preposition
    • between the sexes
    phrases
    • the battle of the sexes
    • equality between the sexes
    • equality of the sexes
    See full entry
  3. [uncountable] physical activity between two people in which they touch each other’s sexual organs, and which may include sexual intercourse
    • sex with somebody He had sex with someone he met in a bar.
    • gay sex
    • the sex act
    • a footballer involved in a sex scandal
    • victims of sex abuse
    • sex education in schools
    • a controversial film containing explicit sex scenes
    • a sex shop (= one selling magazines, objects, etc. that are connected with sex)
    • These drugs may affect your sex drive (= your interest in sex and the ability to have it).
    • Amid such poverty, the sex trade has flourished.
    • The slogan for the hippie generation of the 1960s was sex, drugs and rock and roll.
    see also safe sex, sexual intercourse
    Extra Examples
    • sex between consenting adults
    • sex with her husband
    • They teach that sex outside of marriage is wrong.
    • I have had several sex partners over the years.
    • safer sex practices
    • Sex sells, the advertisers believe.
    • Movies containing scenes of explicit sex are banned.
    • He was convicted of having unlawful sex with an underage girl.
    • to crack down on international sex trafficking
    • He was arrested for sex crimes.
    • The film featured graphic scenes of sex and violence.
    • It's important to abstain from sex until treatment is completed.
    Oxford Collocations Dictionaryadjective
    • anal
    • oral
    • penetrative
    verb + sex
    • engage in
    • have
    • consent to
    sex + noun
    • life
    • drive
    • urge
    preposition
    • sex between
    • sex with
    phrases
    • sex, drugs and rock ’n’ roll
    • sex and violence
    • sex outside of marriage
    See full entry
  4. -sexed
    (in adjectives) having the amount of sexual activity or desire mentioned
    • a highly-sexed person
  5. Word Originlate Middle English (denoting the two categories, male and female): from Old French sexe or Latin sexus.
See sex in the Oxford Advanced American DictionarySee sex in the Oxford Learner's Dictionary of Academic English
6 August 2026
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