Dictionary Definition :
Definition[1]
:
The four short divisions of time: a wink; a snap of the fingers; 羅預 a lava, 20 finger-snaps; and 須臾 ksana, said to be 20 lava; but a lava is 'the sixtieth of a twinkling' (M. W. ) and a ksana an instant.
Source
:
A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous
Definition[2]
:
四須臾===(名數)單時別為四種。如瞬時,彈指時,羅預,須臾是也。
Source
:
丁福保《佛學大辭典》