A period of time
time unit, sixty minutes, man-hour, ampere-hour, planetary hour, horsepower hour, recitation hour, lecture hour, class hour, supper hour, study hour, rush hour; see also time 1.
An appointed time
moment, minute, term; see appointment 2.
of the hour
the time of one's death, one's dying, one's time*; see death 1.
the small <strong>or </strong>wee hours