either
ei-ther · determiner
Definitions
determiner
- 1.
One or the other of two.
- 2.
Each of two.
- 3.
Used after a negative statement to indicate a similarity.
- 4.
Moreover; in addition (in negative contexts).
- 5.
Used with "or" to present alternatives.
Related words
Etymology
From Old English aeghwaether, composed of a meaning "ever" and gehwaether meaning "each of two, whether." The word has maintained its function as a dual pronoun for over a thousand years.