leap year

leap year (a year containing an extra day in order to keep the calendar year synchronised with the astronomical or seasonal year)

class, series of events

Class
series of events
Parent Class
calendar year, numeric quantity
Wikipedia Page
http://en.wikipedia.org/wiki/Leap_year
Wordnet Synset ID
"115202230"
Distinct From
recession, earthquake, Lent, military conflict, match,  …

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  • what is a leap year?
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