1. Being in effect or operation
   "bus service is in operation during the emergency"
   - operational, operating

See also: operative

• queenfish
• queenlike
• queenly
• Queens
• Queensboro Bridge
• queenship
• queenside
• Queensland
• Queensland bottletree
• Queensland grass-cloth plant
• Queensland hemp
• queensland kauri
• Queensland lungfish
• Queensland nut
• Queenslander
• queer
• queer bird
• queer duck
• queerly
• queerness
• quell
• quelled
• quelling
• quellung
• quellung reaction