Spring you evidenced as rewarding first of all — 2016, say

Wikipedia Word definitions in Wikipedia
A leap year (also known as an intercalary year or a bissextile year ) is a year containing one additional day (or, in the case of lunisolar calendars , a month) added to keep the calendar year synchronized with the astronomical or seasonal year . Because ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Leap year \Leap" year`\n. Bissextile; a year containing 366 days; every fourth year which leaps over a day more than a common year, giving to February twenty-nine days. See Bissextile . Note: Every year whose number is divisible by four without a remainder ...

Wiktionary Word definitions in Wiktionary
n. 1 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. 2 In the Jewish calendar ...

WordNet Word definitions in WordNet
n. in the Gregorian calendar: any year divisible by 4 except centenary years not divisible by 400 [syn: intercalary year , 366 days , bissextile year ]

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
late 14c., from leap (v.) + year . So called from its causing fixed festival days, which normally advance one weekday per year, to "leap" ahead one day in the week.

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ Knock! jokes are okay in small doses - like one every second leap year . ▪ The leap year proposal ceremony was conducted near the player's entrance by Ayresome Park disc jockey Mark Page. ▪ This is a leap year , so use that extra ...