adj. Consisting of a single word, such as "Go." or "Whatever."
adj. Pertaining to the stage of development where a child produces simple one-word utterances.
the GNU version of the Collaborative International Dictionary of English
adj. Expressing a phrase or sentence in a single word, -- as is the case in the aboriginal languages of America.
The Century Dictionary and Cyclopedia
Having the force of a whole phrase, as a word or gesture; expressive of a sentence, or of a highly complex idea.
Word Usage
"According to Merriam-Webster, the first definition of "holophrastic" is: using or consisting of a single word that functions as a phrase or sentence."