noun
time; the passage of time
Literary and somewhat old-fashioned; often used in set phrases like 光陰矢の如し (time flies like an arrow). The personification 'Father Time' is a possible translation in poetic contexts.
光陰矢の如しと言うが、本当に一年はあっという間だ。
They say time flies like an arrow, and a year really does pass in the blink of an eye.
光陰は人を待たず、気がつけば
Time waits for no one; before I knew it, it's already autumn.