In operation
In operation adjective - Being in effect or operation.
Open and in operation are semantically related. in active topic. In some cases you can use "Open" instead an adjective phrase "In operation".
Open
Open adjective - Allowing passage without obstruction.
In operation and open are semantically related. Sometimes you can use "In operation" instead an adjective "Open".
Mutual synonyms
Both terms in one sentence
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Of course, as soon as one threat is dealt with, the ones the heroes thought they could safely ignore for the moment come out into the open with their new scheme fully in operation.
Source: Tabletop Game / Tech Infantry - Moore served in Operation Sunburst a few years prior, which saw the NCR and Brotherhood in a state of open war and in which the NCR incurred massive casualties before wearing the Brotherhood down via sheer weight of numbers.
Source: Ungrateful Bastard
Cite this Source
Open and In operation. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/in_operation/open
In operation & Open. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/in_operation/open>.
Open or In operation. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/in_operation/open.
Google Ngram Viewer shows how "in operation" and "open" have occurred on timeline