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activity US English

The condition in which things are happening or being done

activity US Thesaurus

there was a lot of activity in the area

free activity US English

Attributive designating or relating to a method of teaching in which children learn through their own efforts and experiments and not through instruction by a teacher.

activity ratio US English

Any of a number of ratios used to measure the efficiency of resource management.

activity series US English

A list of chemical elements (especially metals) arranged in order of reactivity; specifically = electrochemical series.

activity wheel US English

= exercise wheel.

multi-activity US English

Involved or engaged in several activities; specifically offering, equipped for, or involving a variety of sporting or leisure activities.

activity sampling US English

(In work study) a form of sampling in which a large number of observations are made of a group of machines or workers over a period of time in order to predict what percentage of the total time is occupied by any one activity.

optical activity US English

The property (displayed by solutions of some compounds, notably many sugars) of rotating the plane of polarization of plane-polarized light

practical activity US English

Social practice, especially as the medium through which theory is realized and becomes actual.

specific activity US English

The activity of a given radioisotope per unit mass

surface activity US English

Activity on or at a surface, superficial activity.

displacement activity US English

An animal or human activity that seems inappropriate to the context, such as head-scratching when one is confused, considered to arise unconsciously when a conflict between antagonistic urges cannot be resolved

retractile activity US English

The ability to induce retraction or contraction, especially of a fibrin clot.

activity of daily living US English

(Chiefly in plural) any of a number of routine tasks and functions a person must be able to perform in order to maintain independence; abbreviated ADL.

beehive US English

A busy, crowded place

activity coefficient in activity US English

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