n. the addition of an ingredient for the purpose of enrichment (as the addition of alcohol to wine or the addition of vitamins to food)

n. a device designed to provide additional strength; "the cardboard backing was just a strengthener"; "he used gummed reinforcements to hold the page in his notebook"

n. an additional dose that makes sure the first dose was effective

n. a structural member used to stiffen a framework

n. (psychology) a stimulus that strengthens or weakens the behavior that produced it

n. money to support a worthy person or cause

n. the act of putting a liquid into the body by means of a syringe; "the nurse gave him a flu shot"

n. lowest support of a structure; "it was built on a base of solid rock"; "he stood at the foot of the tower"

n. a support placed beneath or against something to keep it from shaking or falling

n. supporting structure that holds up or provides a foundation; "the statue stood on a marble support"

n. a framework of beams (rafters, posts, struts) forming a rigid structure that supports a roof or bridge or other structure

n. group action in opposition to those in power