Overview

An interjection is a brief spoken or written expression used to convey emotion, a sudden reaction, or a social signal. Interjections may be single words (Wow!, Ouch!), sounds (ah, eh), or short phrases (Good grief!). They often stand alone as complete utterances in conversation and are treated as a distinct category in many dictionaries. For lists and quick examples see common interjections.

Characteristics and grammar

Interjections are typically syntactically independent: they do not form an argument of the verb and usually do not participate in sentence structure. In writing they are commonly set off with punctuation such as exclamation marks, commas, or ellipses; speakers rely on intonation and prosody to convey force or attitude. Many interjections are invariant (they do not take tense or number), and some can be integrated into larger clauses as parenthetic elements. For guidance on punctuation and capitalization consult usage notes.

Types and examples

  • Emotive: expressions of feeling or reaction, e.g. "Wow!", "Ouch!".
  • Phatic/social: greetings and farewells, e.g. "Hi!", "Bye!", "Congrats!".
  • Fillers/hesitation: discourse-management sounds, e.g. "Um", "Er", "Well...".
  • Attention-getters: calls for notice or warning, e.g. "Hey!", "Look!", "Watch out!".
  • Imitative/onomatopoeic: sounds that mimic noises, e.g. "Bang!", "Meow!".

For a concise typology with examples see interjection types.

Functions and uses

Interjections perform pragmatic roles: they express emotion (joy, surprise, pain), maintain social rapport (greetings, farewells), direct attention, and manage discourse (hesitation or turn-taking). Their meaning often depends heavily on prosody, context, and cultural norms; the same utterance can be playful, angry, or sarcastic depending on delivery. Writers and dramatists use interjections to add realism and voice to dialogue; examples and commentary are available at pragmatic notes.

Cross-linguistic notes, development and writing

Interjections appear in all known languages and many are rooted in nonverbal vocalizations. Some reactions, such as cries of pain or laughter, show universal tendencies, while many interjections are language-specific and culturally marked. Children produce interjection-like vocalizations early in development, often before complex words, and speakers sometimes substitute milder forms (euphemisms) in polite contexts. Editorial and orthographic decisions about capitalization and punctuation vary by style guide; for practical advice see writing tips.