SynonymDefinitionAntonym.com - English Synonym Dictionary

A person who is a participating member of an organization

The voice used to indicate that the grammatical subject of the verb is performing the action or causing the happening denoted by the verb

Chemical agent capable of activity

(used of verbs (e.g. `to run') and participial adjectives (e.g. `running' in `running water')) expressing action rather than a state of being

Characterized by energetic activity

Tending to become more severe or wider in scope

Disposed to take action or effectuate change

(of e.g. volcanos) erupting or liable to erupt

(of e.g. volcanos) capable of erupting

Full of activity or engaged in continuous activity

Exerting influence or producing a change or effect

Engaged in full-time work

Expressing that the subject of the sentence has the semantic function of actor:

(of the sun) characterized by an increased occurrence of sunspots and flares and radio emissions

In operation

Taking part in an activity

Engaged in or ready for military or naval operations