ALTERNATE a. 2 definitions
Designating the members in a series, which regularly intervene between the members of another series, as the odd or even numbers of the numerals; every other; every second; as, the alternate members 1, 3, 5, 7, etc. ; read every alternate line.
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.