indeclinable

The definition of indeclinable is a grammar term that is a word that must be determined from its context because it does not have anything added to show a grammatical category such as tense, gender, mood or number.

(adjective)

An example of an indeclinable word is the word "must" or the word "coffee."

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See indeclinable in Webster's New World College Dictionary

adjective

Gram. not declinable; having no case inflections

See indeclinable in American Heritage Dictionary 4

adjective
  1. Without grammatical inflection.
  2. Of or being a word that lacks grammatical inflection though belonging to a form class whose members are usually inflected.
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