The length of time required by the earth to make one complete revolution around the sun, or by the sun to complete approximately its apparent circuit among the fixed stars from vernal equinox to vernal equinox, consisting of 365 days, 5 hours, 48 minutes, and 46 seconds.

年。

The time required by a planet to make one complete revolution around the sun.

行星绕日一全周之时间；行星的公转周期。

Age; time of life.

年纪；年龄。

Long time.

长期。

Any period of twelve consecutive months.

连续的十二个月期间。

Any period out of a full year devoted to a recurring activity.

以一整年为行事之阶段。