Synonyms of 'in operation'
▷ See operation
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If you say that a person or animal is active in a particular place or at a particular time, you mean that they are performing their usual activities or performing a particular activity.
Guerrilla groups are active in the province.
When something such as a law or an agreement becomes effective, it begins officially to apply or be valid.
The new rules will become effective in the next few days.
Thesaurus for in operation from the Collins English Thesaurus
in the act or process of making, working , etc.