What is the Meaning of "When"?

Definition of When

Quick Meaning of When

Question word about time; also joins clauses.

Detailed Definition of When

At what time; during the time that.

How to Pronounce When

IPA: /wɛn/

when

Stress pattern: O (1-syllable word).

Tip: One syllable: WEN.

Full pronunciation guide for “when” →

Origin and Etymology of When

From Old English hwænne.

How to Use When in a Sentence

Each example shows “when” with a CEFR level so learners can pick examples that match their fluency.

“When is your birthday?”

A1 daily
“She smiled when she saw him.”

A2 conversation
“When you finish, let me know.”

A2 written

Synonyms and Antonyms of When

Common Synonyms for When

Smart Synonyms for When — When to Use Each

while: simultaneous ongoing time period
during: within specified time period

See all synonyms for “when” →

Common Collocations with When

These phrases pair with “when” in everyday English:

when you
when will
when did
when can
when is

Common Mistakes When Using When

Even fluent speakers slip up with “when”. Here’s how to avoid the most common errors:

✗ Wrong: When you will come tomorrow?: ✓ Correct: When will you come tomorrow?; Why: Invert verb and subject in questions.
✗ Wrong: I will help you when I will finish work.: ✓ Correct: I will help when I finish work.; Why: Don't repeat will in time clause.
✗ Wrong: She not arrive when he come.: ✓ Correct: She didn't arrive when he came.; Why: Use proper past tense forms.