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offices
See department and office references.

off-campus (if used as a modifier), off campus (not a modifier)

I enjoy off-campus living. I live off campus.

offline, online
one word, no hyphen

on-campus (if used as a modifier), on campus (not a modifier)

I enjoy on-campus living. I live on campus.

one-fourth, one-half

O.S.B.
Abbreviation for Order of Saint Benedict. Usually preceded and followed by a comma in running text.

Fr. Jonathan DeFelice, O.S.B., is president of Saint Anselm College.

over, more than
Use “over” when referring to spatial references (e.g., The deer jumped over the fence.). Use “more than” when referring to amounts or numbers.

Correct: The cost of the gift was more than $50.
Incorrect: The cost of the gift was over $50.