In operation
In operation adjective - Being in effect or operation.
Perpetual and in operation are semantically related. in continuous topic. In some cases you can use "Perpetual" instead an adjective phrase "In operation".
Perpetual
Perpetual adjective - Going on and on without any interruptions.
In operation and perpetual are semantically related. Sometimes you can use "In operation" instead an adjective "Perpetual".
Mutual synonyms
Cite this Source
Perpetual and In operation. (2016). Retrieved 2026, August 10, from https://thesaurus.plus/related/in_operation/perpetual
In operation & Perpetual. N.p., 2016. Web. 10 Aug. 2026. <https://thesaurus.plus/related/in_operation/perpetual>.
Perpetual or In operation. 2016. Accessed August 10, 2026. https://thesaurus.plus/related/in_operation/perpetual.
Google Ngram Viewer shows how "in operation" and "perpetual" have occurred on timeline