APARTMENT HOUSE n.
A building comprising a number of suites designed for separate housekeeping tenements, but having conveniences, such as heat, light, elevator service, etc., furnished in common; -- often distinguished in the United States from a flat house.
APO n.
A prefix from a Greek preposition. It usually signifies from, away from, off, or asunder, separate; as, in apocope (a cutting off), apostate, apostle (one sent away), apocarpous.