What is the meaning of Again?

Another time; once more.

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.

Tell me again, say again; used in asking a question to which one may have already received an answer that one cannot remember.

I ask again, I say again; used in repeating a question or statement.

Here too, here also, in this case as well; used in applying a previously made point to a new instance; sometimes preceded by "here".

Back in the reverse direction, or to an original starting point.

Back (to a former place or state).

In return, as a reciprocal action; back.

In any other place.

On the other hand.

Moreover; besides; further.

Against.

back, in the opposite direction

again, anew

opposite, facing

against, opposed to (literally or figuratively)

In preparation for, in advance of

Source: wiktionary.org