Definitions

1. conjunction

used to indicate a choice between two or more alternatives, or to introduce an exception

“Do you want to go to the movies or stay home?”

2. preposition

used to indicate a boundary or limit

“The house stands on a hill or a mountain”

3. adverb

used to indicate a possibility or a potential situation

“She may win the competition or not”

4. noun

a letter used in the abbreviation of words

“The or in honor”