Definition of activity in English:


Syllabification: ac·tiv·i·ty
Pronunciation: /akˈtivitē

noun (plural activities)

  • 1The condition in which things are happening or being done: there has been a sustained level of activity in the economy 16, they say, is too young for sexual activity
    More example sentences
    • A study in chimpanzees showed lower levels of sexual activity when the females were given oral contraceptives.
    • A second, functional level of military activity responded to shifts in the conduct of operations.
    • In contrast, growth of business activity across the UK private sector as a whole picked up slightly to a strong pace.
  • 1.1Busy or vigorous action or movement: the room was a hive of activity
    More example sentences
    • The post office was always a hive of activity with people bustling about.
    • After breakfast, the house is bustling with activity and movement.
    • The locality has been a hive of activity in recent weeks.
    bustle, hustle and bustle, busyness, action, liveliness, movement, life, stir, flurry; happenings, occurrences, proceedings, events, incidents
  • 2 (usually activities) A thing that a person or group does or has done: the firm’s marketing activities
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    • The children attending the club have an opportunity to do homework and other activities.
    • The pain may result in inability to do routine work or household activities.
    • He said there was no connection between his gifts to to the Party and his business activities.
    pursuit, occupation, interest, hobby, pastime, recreation, diversion; venture, undertaking, enterprise, project, scheme, business, entertainment; act, action, deed, exploit
  • 2.1A recreational pursuit or pastime: a range of sports activities
    More example sentences
    • He said the club's social activities have ranged from football to having its own choral society.
    • Most contracts will exclude any hazardous water sports or adventurous activities.
    • He encouraged the men to get involved in sporting activities, and football soon became a favourite.
  • 2.2 (activities) Actions taken by a group in order to achieve their aims: the police were investigating anarchist activities
    More example sentences
    • He's planning a $9.5 billion electronic bank robbery, the proceeds of which he can use to finance terrorist activities.
    • Engaging volunteers in fund-raising activities broadens the funding base and increases assets.
    • A key question is the appropriate role of the private and public sectors in reducing losses and offering insurance protection against extreme risks such as natural disasters and terrorist activities.
  • 3The degree to which something displays its characteristic property or behavior: abnormal liver enzyme activities
    More example sentences
    • The specificity and catalytic activity of the enzyme depend on the particular amino acids lining the active site.
    • It is frequently reported that a crystalline enzyme retains some catalytic activity.
    • These authors reported significantly lower activity of the oxidative enzymes in COPD patients.
  • 3.1 Chemistry A thermodynamic quantity representing the effective concentration of a particular component in a solution or other system, equal to its concentration multiplied by an activity coefficient.
    More example sentences
    • The activity coefficient of, say, a urea molecule in solution results from its interaction with other urea molecules.
    • Methods of correcting the activity coefficient of carbon for alloy content are available.
    • While hydrogen amounts were the same, the hydrogen ions were altered to present a much higher degree of activity.


late Middle English: from French activité or late Latin activitas, from Latin act- 'done', from the verb agere.

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