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Related to interjectional: protuberance
1. A sudden, short utterance; an ejaculation.
2. Abbr. interj. or int.
a. The part of speech that usually expresses emotion and is capable of standing alone.
b. Any of the words belonging to this part of speech, such as Ugh! or Wow!
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.