As a Noun:
1. A thing or a person which is not one of the people or things that you have just mentioned or have just been talking about, but is additional. English = the other, another, one other.
As a Verb or Adjective:
1. To be a thing or a person which is not one of the people or things that you have just mentioned or have just been talking about, but is additional. English = other, another, one other; (be) other, (be) another, (be) one other.
As Modifier:
1. Used at the beginning of a sentence to introduce things of a different sort in addition to the sort of things you have just mentioned. English = otherwise.
2. Used immediately after a question sign (e.g., 'who' or 'what') to ask the same question a second time, but this time about something or someone different (e.g., 'Who else?). English = else.