once

definition: on one occasion
example: once I ran into her
speech part: adverb
synonyms: one time in one case
definition: at a previous time
example:
speech part: adverb
synonyms: formerly at one time erstwhile erst
definition: as soon as
example: once we are home, we can rest
speech part: adverb
synonyms:

once is explained and pronounced

How once is being used?