To put an object into a place where it will rest; to fix; to set firm.

“Be sure to seat the gasket properly before attaching the cover.”

To provide with places to sit.

“The waiter seated us and asked what we would like to drink.”

To request or direct one or more persons to sit.

“Please seat the audience after the anthem and then introduce the first speaker.”

Sitting

Of a woman's skirt, stretched out and baggy over the wearer's buttocks from much sitting while wearing the skirt

Fixed; confirmed