Definition of activity in English:


Line breaks: ac¦tiv|ity
Pronunciation: /akˈtɪvɪti

noun (plural activities)

  • 2 (usually activities) A thing that a person or group does or has done: the firm’s marketing activities
    More example sentences
    • 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, venture, undertaking, enterprise, project, scheme, business, job, affair, task, campaign; interest, hobby, pastime, recreation, diversion, entertainment; act, action, deed, doing, exploit, manoeuvre
    informal thing, lark, caper
  • 2.1A recreational pursuit or pastime: a range of sporting 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.
  • 3 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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