OCONUS (outside the continental U.S.) – Refers to any place outside of the 48 continental, or contiguous, states and the District of Columbia. It includes Alaska and Hawaii.
office – Capitalize office when it is part of an agency’s formal name: Office of Management and Budget. Lowercase in all other uses, including phrases such as the office of the attorney general, the U.S. attorney’s office.
offline – No hyphen.
off-site – Use the hyphen, also on-site.
online – One word in all cases for the computer connection term.
ordinal numbers –Ordinal numbers indicate order. Spell out first through ninth and then use figures: first, third, 10th, 101st. Ordinal numbers should not be superscript; the font size of the letters should match the font size of the number. Correct: 10th. Incorrect: 10th.
over/more than – Over generally refers to spatial relationships, as opposed to more than, which is used to indicate greater numerical value. The plane flew over the city. Pay went up more than $100.
overseas – Refers to any place other than 50 United States and the District of Columbia. The term includes U.S. territories and possessions, and foreign countries. When referring to foreign countries, MC&FP describes them as “outside of the United States and outside of the U.S. territories and possessions.”
Oval Office – The White House office of the president.