Increase meaning : An amount by which a quantity is increased. For a quantity, the act or process of becoming larger Offspring, progeny The creation of one or more new stitches; see Increase (knitting). (of a quantity, etc.) To become larger or greater. To make (a quantity, etc.) larger. To multiply by the production of young; to be fertile, fruitful, or prolific. To become more nearly full; to show more of the surface; to wax.