an·oth·er 
(
ə-n
ŭthər)
adj.1. One more; an additional: had another cup of coffee.
2. Distinctly different from the first: took another route to town.
3. Some other: put it off to another day.
pron.1. An additional one: one encore followed by another.
2. A different one: This shirt is too big; I'll try another.
3. One of an undetermined number or group: for one reason or another. See Usage Note at each other.
[Middle English on other : on, one; see ONE + other, other; see OTHER.]