Lite

Also called light, pane

A single pane of glass in a sash.

A lite is one pane of glass, as divided by the muntins. Windows are described by their lite count, upper sash first: the window in the diagram is six-over-six.

A sash with one undivided sheet of glass has a single lite.

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Awning window, from inside

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Bay window, in plan

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Casement window, from inside

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Double-hung window, from outside

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Double-hung window, from inside

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Two double-hung windows in one opening

Related

MuntinA narrow bar that divides a sash into smaller panes.
GlazingThe glass in a window, and the work of installing it.
SashThe framework that holds the glass, and the part of the window that moves.
Insulating glass unitTwo or more panes of glass sealed together around a gap that insulates.