(marketing, singular only) A size for a container of goods, among the largest sizes meant for sale to a householder consumer.

(singular only, marketing euphemistic) A small size.

(marketing) Small in size.

Small enough to fit into a pocket. / (idiomatic) Small-scale, downsized.

Indicates that the speaker needs a smaller size (of clothes or shoes).

plural of plus size

A size of clothing designed specifically for overweight people.

(of clothing) Designed to fit an overweight person. / (of a person) Overweight.

plural of cup size

(US) Of paper: in sheets measuring 8.5 × 14 inches (215.9 × 355.6 mm).