| action | (verb) put in effect | Synonyms: accomplish, carry out, carry through, execute, fulfil, fulfill |
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| (verb) institute legal proceedings against; file a suit against | Synonyms: litigate, process, sue |
| activate | (verb) make active or more active | - |
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| (verb) make (substances) radioactive | - |
| (verb) aerate (sewage) so as to favor the growth of organisms that decompose organic matter | Synonyms: aerate |
| (verb) make more adsorptive | - |
| (verb) put in motion or move to act | Synonyms: actuate, set off, spark, spark off, touch off, trigger, trigger off, trip |