Crossword Genius

Ultimatum word (6)

Ross

I think it could be either:

either

unless

'ultimatum word' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for either that I've seen before include "Her tie (anag.)" , "Word introducing first of two 16s" , "Word introducing first alternative" , "One of two alternatives" , "offered a choice" .)

I've seen this clue in the LA Times and The Star Tribune.
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