1
a
: the period of about 3651/4 solar days required for one revolution of the earth around the sun
b
: the time required for the apparent sun to return to an arbitrary fixed or moving reference point in the sky
c
: the time in which a planet completes a revolution about the sun
two Mercury years
2
a
: a cycle in the Gregorian calendar of 365 or 366 days divided into 12 months beginning with January and ending with December
b
: a period of time equal to one year of the Gregorian calendar but beginning at a different time
3
: a calendar year specified usually by a number
died in the year 1900
4
years plural
: a time or era having a special significance
their glory years
5
a
: 12 months that constitute a measure of age or duration
her 21st year
The twins are two years old.
—often used in combinationtwo-year-old twins
a six-year-old dog
The winner is a 16-year-old from Kentucky.
b
6
: a period of time (such as the usually 9-month period in which a school is in session) other than a calendar year
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Merriam-Webster unabridged
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