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OP

observation post. Also,O.P.

var. of ob- (by assimilation) before p: oppose.

opus.

1. opera.
2. operation.
3. opposite.
4. opus.

1. observation post.
2. Brit. Theat.See opposite prompt.
3. Order of Preachers (Dominican).
4. out of print.
5. overproof.

out of print.

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