adverb
Another time: indicating a repeat of an action.
Back (to a former place or state).
Over and above a factor of one.
Used metalinguistically, with the repetition being in the discussion, or in the linguistic or pragmatic context of the discussion, rather than in the subject of discussion.
(obsolete) Back in the reverse direction, or to an original starting point.
(obsolete) In return, as a reciprocal action; back.
(obsolete) In any other place.
(obsolete) On the other hand.
Moreover; besides; further.
preposition
(dialectal, otherwise obsolete) Against.