This is the 8978th most frequent Russian word.
рас
The word "рас" in Russian can mean "once" or "time" (as in a single instance), though it might also appear as part of other words or phrases. Context is important for accurate meaning.
The word 'раз' is used in a conditional or situational construction meaning 'since (it is the case)'.
Раз уж ты здесь, помоги мне.
Since you are here, help me.
The word 'раз' is used to denote 'once' or 'one time' in this sentence.
Один раз я был в этом городе.
I was in this city once.
The word 'раз' is used to denote 'time' as an instance or occasion in this sentence.