1 : at, during, or just after the time that She wants to leave when I do. 2 : in the event that : if When you have a question, raise your hand. ... 4 : the time at which Tomorrow is when we leave.

What is the definition of when?

contraction of when is:When's the show over? ... contraction of when has:When's he ever been an authority?

When and is used?

What does and mean in an address? When and is used in describing locations, it indicates a point where two streets meet or cross. For example, in "I live at Third and Main," the and indicates that the speaker lives close to where Third Street and Main Street meet or cross.