Clipping of positive.
I'm not absolutely pos on that, sir.
Clipping of possessive.
Initialism of proof of service.
Initialism of peripheral oxygen saturation.
Initialism of part of speech.
Initialism of parent over shoulder (i.e. observing the young user's conversation).
Hang on, POS ... can you tell me about it later?
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Eight POSs are defined in traditional English grammar: noun, verb, adjective, adverb, pronoun, preposition, conjunction, and interjection.