(biology) Movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy.

(grammar) A participle indicating an ongoing or completed action or state in the active voice, where a noun modified by the participle is taken to represent the agent of the action denoted by the verb.

plural of active ingredient

plural of CH activation

plural of activated sludge

plural of extravehicular activity

Partially active

(computer science) A function that defines the output of a particular node in an artificial neural network on the basis of its inputs.

plural of active power

The collection of words and phrases that someone commonly uses in speech and writing.