expression
this (is) again
Literally 'this again', used when something repeats or when a situation is the same as before. Often carries a nuance of mild surprise or exasperation.
これまた同じ間違いをしてしまった。
I made the same mistake again.
これまた雨か。
Rain again, huh?
expression, adverb
Used as an intensifier, often in casual speech, to emphasize an adjective or state. Similar to とても or すごく.
これまた美味しいラーメンだね。
This ramen is really delicious.
彼の話はこれまた面白かった。
His story was so interesting.