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Definition of op. 1  1 chiefly US : a set of planned actions for a particular purpose âusually plural military ops [=operations] 2  2 : op art. 3  3 British, informal : a medical operation â see also photo op.
At an online discussion forum, you see the phrase in regards to the OP, I think that health care is going to be pivotal in this coming election. What does this OP expression mean? The original poster is the person who started a discussion thread, and OP is used to refer back to that person as the responses grow.