leap year

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leap year:

see calendarcalendar
[Lat., from Kalends], system of reckoning time for the practical purpose of recording past events and calculating dates for future plans. The calendar is based on noting ordinary and easily observable natural events, the cycle of the sun through the seasons with equinox
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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/

leap year

A year that contains one more day than the usual calendar year so that the average length of the year is brought closer to the tropical year of 365.2422 days or to the lunar year. In the Julian calendar a leap year of 366 days occurred once every four years when the year was divisible by four. In the Gregorian calendar this rule was modified so that century years are leap years only when they are divisible by 400. The additional day is now added at the end of February (Feb. 29).
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

leap year

[′lēp ‚yir]
(astronomy)
A year with 366, and not 365, days.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

leap year

a calendar year of 366 days, February 29 (leap day) being the additional day, that occurs every four years (those whose number is divisible by four) except for century years whose number is not divisible by 400. It offsets the difference between the length of the solar year (365.2422 days) and the calendar year of 365 days
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
This will continue to be repeated every four years until 2028 (1407 in the Persian calendar) when the Iranian leap day will be pushed forward another year.
Leap Day events for the public will include opening at 10am for a special Monday Toddler Time from 10am - 1pm for $1 per person per hour.
If modern leap day traditions were ever to emerge, 2000 would have been the year for them.
We never really thought of Rhona as being a traditionalist, but it seems she's decided that this Leap Day she's going to take advantage of the old custom - that says women can propose to men - and ask Paddy to marry her.
Canadian airline WestJet announced on Thursday that it will celebrate its 16th anniversary on 29 February with a special offer of one-way USD16 fares for travellers with leap day birthdays.
According to Irish legend, a man who is proposed to on a leap day must accept, thus the title.
Management notes that front-end comparable-store results were pared by 1% and overall same-store growth by 0.8 % because of calendar changes and a leap day in fiscal 2008.
The chance of being born on Leap Day is about 684 out of a million, or one in 1,461.
I realize there are several definitions of "blue Moon." But I'm curious if a blue Moon, in the sense of the second full Moon in a month, has ever occurred on February 29th (leap day)?
Most private-sector research institutions estimate an increase in GDP of at least 2%, following two consecutive quarters of decline, owing in part to the leap day in February this year and some signs of self-sustained recovery.
But there's an exception to this rule: At the start of each century, Gregorian calendars, which are now used worldwide, ignore leap years, and February has only 28 days--there was no leap day in 1700, 1800, or 1900.
29 Leap Day, and an unusual one (see box, page 94); in 1980, Mars and Jupiter have conjunction at nearbrightest for the only time in 286 years, with the full moon nearby.