when
adverb
[ wɛn ]
• at what time.
• "when did you last see him?"
when
adverb
• at or on which (referring to a time or circumstance).
• "Saturday is the day when I get my hair done"
when
conjunction
• at or during the time that.
• "I loved maths when I was at school"
• after which; and just then (implying suddenness).
• "he had just drifted off to sleep when the phone rang"
• in view of the fact that; considering that.
• "why bother to paint it when you can photograph it with the same effect?"
• although; whereas.
• "I'm saying it now when I should have told you long ago"
Origin:
Old English hwanne, hwenne ; of Germanic origin; related to German wenn ‘if’, wann ‘when’.
