hour

The definition of an hour is sixty minutes, or a period of time.

(noun)

See hour in Webster's New World College Dictionary

noun

1. a division of time, one of the twenty-four parts of a day; sixty minutes
2. one of the twelve points on a clock, watch, etc. marking the beginning or end of such a division: the ninth hour
a point or period of time; specif.,
1. a fixed point or period of time for a particular activity, occasion, etc.: the dinner hour
2. an indefinite period of time of a specified kind: his finest hour
3. a period fixed for work, receiving patients, etc.: office hours from 2 to 5
4. the usual times for getting up or going to bed: to keep late hours
the time of day as indicated by a timepiece or as reckoned from midnight to midnight, expressed in hours and minutes: arrival at 14:30 hours
a measure of the distance usually covered in an hour: two hours from New York to Philadelphia by rail
Astron. a sidereal hour; angular unit equaling 15° measured along the celestial equator
Eccles. a canonical hour or the prayers then said
☆ Educ. a class session of approximately one hour: each hour of a course per week is a unit of academic credit

Origin: ME < OFr hore < L hora < Gr hōra, hour, time, period, season < IE base *yē-, year, summer (< *ei-, to go) > year

See hour in American Heritage Dictionary 4

noun Abbr. hr.

One of the 24 equal parts of a day.
a. One of the points on a timepiece marking off 12 or 24 successive intervals of 60 minutes, from midnight to noon and noon to midnight or from midnight to midnight.
b. The time of day indicated by a 12-hour clock.
c. hours The time of day determined on a 24-hour basis: 1730 hours is 5:30 P.M.
A unit of measure of longitude or right ascension, equal to 15° or ¹/₂₄ of a great circle.
a. A customary or fixed time: the dinner hour.
b. hours A set period of time for a specified activity: banking hours.
a. A particular time: their hour of need.
b. A significant time: Her hour had come.
c. The present time: the man of the hour.
a. The work that can be accomplished in an hour.
b. The distance that can be traveled in an hour.
a. A single session of a school day or class.
b. A credit hour.
hours Ecclesiastical The canonical hours.