The condition in which things are happening or being done
there was a lot of activity in the area
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.
Any of a number of ratios used to measure the efficiency of resource management.
A list of chemical elements (especially metals) arranged in order of reactivity; specifically = electrochemical series.
= exercise wheel.
Involved or engaged in several activities; specifically offering, equipped for, or involving a variety of sporting or leisure activities.
(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.
The property (displayed by solutions of some compounds, notably many sugars) of rotating the plane of polarization of plane-polarized light
Social practice, especially as the medium through which theory is realized and becomes actual.
The activity of a given radioisotope per unit mass
Activity on or at a surface, superficial activity.
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
The ability to induce retraction or contraction, especially of a fibrin clot.
(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.
A busy, crowded place
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