Definition of activity in English:

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Pronunciation: /akˈtivədē/

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
informal toing and froing, comings and goings
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, 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.
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.

Words that rhyme with activity


For editors and proofreaders

Syllabification: ac·tiv·i·ty

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