Apparently a primary word; an "hour" (literally or figuratively) -- day, hour, instant, season, X short, (even-)tide, (high) time.

ὥρᾳ (ōra) − 61 Occurrences

ὧραί (ōrai) − 1 Occurrence

ὥραν (ōran) − 22 Occurrences

ὥρας (ōras) − 21 Occurrences

ὡρῶν (ōrōn) − 1 Occurrence