A broad description for glass installations with little or no visually dominant perimeter framing, often using clamps, channels, pivots, patch fittings, sealant joints, or point supports.

Rak Holding · Image source · CC BY-SA 3.0 · Image source · License
Meaning and boundaries
Frameless is an appearance description, not an engineering classification or proof that the glass is non-load-bearing.
Why it matters in glass restoration
The concealed support method and glass function must be identified before treating doors, partitions, railings, canopies, or other minimally framed assemblies.