The other one; the second of two.
An other, another (person, etc), more often rendered as another.
Not the one or ones previously referred to.
See other (determiner) below.
Alien.
Different.
Second.
To regard, label, or treat as an "other", as not part of the same group; to view as different and alien.
To treat as different or separate; segregate; ostracise.
Second favourite.
The person who finishes second, or in any position after the first.