Another time; once more.
"I hope you can join us for dinner again next weekend."
In plain English: Again means doing something another time after it has already happened once.
"Let's try this puzzle again tomorrow."
Usage: Use "again" to indicate that an action is repeated or will happen another time. Place it at the end of a sentence after the verb or immediately before the main verb when used in a negative construction like "not again."
Against.
"He was again when he tried to push past the line without showing his ticket."
The word "again" comes from Old English onġēan, which originally meant "against." It traveled into modern English with the same meaning it held in its earlier form.