One individual piece or pane of glass within a monolithic, laminated, or insulating-glass construction.

GlassRenu archive
Meaning and boundaries
A lite is not necessarily a complete glazing unit; an IGU contains multiple lites and laminated glass contains multiple plies bonded by interlayer.
Why it matters in glass restoration
The accessible lite and surface number determine whether polishing reaches ordinary glass, a coating, film, laminate interface, or protected cavity.