8
operational(adjective, active, effective, running, working)
7
active(continuous, running, working, operative, functioning)
6
effective(adjective, active, running, working, operative)
6
operating(adjective, active, continuous, working, operative)
5
functioning(active, effective, running, working, operative)
5
in effect(expression, active, effective, running, working)
4
functional(adjective, open, reasonable, sensible, active)
4
going(continuous, working, operative, flowing, operating)
4
in force(expression, active, effective, running, working)
4
operative(adjective, direct, reasonable, active, useful)
3
at work
3
ongoing(active, operative, operational)
2
going on
2
in action(expression, adjective, reasonable, sensible, useful)
2
in process(expression, underway, marching)
2
in the works(expression, idiom)
2
in use(expression, active, effective, operative, operational)
2
practical(adjective, useful, realistic, applied, workaday)
2
progress
2
running(adjective, continuous, working, operative, functioning)
<123458>
11 years ago|1.3k views|share |citing 
APASmart Define. (2015). in operation thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/in_operation/thesaurus/synonyms
ChicagoSmart Define. 2015. "in operation thesaurus" https://smartdefine.org/in_operation/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, in operation thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/in_operation/thesaurus/synonyms>.
MLASmart Define. "in operation thesaurus" 13 April 2015. Web. 20 September 2026. <https://smartdefine.org/in_operation/thesaurus/synonyms>