1) or, rather

1a) implying that the latter choice is preferred

1b) or if, introducing an example to be seen under a particular principle

1c) (in series) either...or, whether...or

1d) if perchance

1e) except, or else

2) whether, not the least, if, otherwise, also, and, then

אוֹ conj or or rather sometimes implying a preference, nearly or or if introducing a sentence, esp. a particular case under a general principle,= if perchance except once, with the juss. = 320.