The designed space between the edge of a glass lite and the adjacent frame, stop, setting surface, or other hard component.
GlassRenu · Educational illustration
Meaning and boundaries
It is not glass bite and should not be filled or bridged without the system design allowing it.
Why it matters in glass restoration
Clearance accommodates fabrication tolerances, movement, drainage, and isolation from damaging glass-to-metal or glass-to-glass contact.