Definition of activity in English:

Share this entry


Pronunciation: /akˈtɪvɪti/

noun (plural activities)

1 [mass noun] The condition in which things are happening or being done: there has been a sustained level of activity in the economy
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, animation, commotion, flurry, tumult, hubbub, excitement, agitation, fuss, whirl;
happenings, occurrences, proceedings, events, incidents
informal toing and froing, comings and goings, to-do
archaic hurry-scurry, pother
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.
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

Line breaks: ac¦tiv|ity

Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.