(n) :
in the
Gregorian calendar, a
year having 366
days instead of the usual 365, with the extra day added to compensate for the fact that the
Earth rotates approximately 365.25 times for each
revolution it makes around the
Sun; in the
Hebrew calendar or other
lunisolar calendars, a year having 13
months instead of 12, with the extra month added because 19 solar years is approximately 19*12+7 lunar months