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1. In service; in functional operating order. After three weeks in the shop, my car is finally in commission again.
2. Of a Navy vessel, manned, armed, and in condition for active service. Also phrased as "into commission. The new capital ship went into commission this Friday after a ceremonial launch. The cruiser is the oldest vessel still in commission in the entire Navy's fleet.
see under out of commission.
1. In active service. Used of a ship.
2. In use or in usable condition.