Deeper Dive: again
again
adverb  [OE. agein, agayn, AS. ongegn, ongeán, against, again; on + geán, akin to Ger. gegewn against, Icel. gegn. Cf. Gainsay.] 
 
1. In return, back; as, bring us word again. 
2. Another time; once more; anew.
If a man die, shall he live again? Job xiv. 14.
3. Once repeated; – of quantity; as, as large again, half as much again. 
4. In any other place. [Archaic] Bacon.
5. On the other hand. 
“The one is my sovereign . . . the other again is my kinsman.” Shak.
6. Moreover; besides; further.
Again, it is of great consequence to avoid, etc. Herschel.
Again and again
more than once; often; repeatedly.
Now and again
now and then; occasionally.
To and again
to and fro. [Obs.]De Foe.
 
☞ Again was formerly used in many verbal combinations, as, again-witness, to witness against; again-ride, to ride against; again-come, to come against, to encounter; again-bring, to bring back, etc. 
A-gain′ 
A-gains′ preposition Against; also, towards (in order to meet). [Obs.]
Albeit that it is again his kind. Chaucer.
-- Webster's unabridged 1913
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