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"
(psychology) a stimulus that strengthens or weakens the behavior that produced it - reinforcing stimulus
information that makes more forcible or convincing "his gestures provided eloquent reinforcement for his complaints" - reenforcement
a military operation (often involving new supplies of men and materiel) to strengthen a military force or aid in the performance of its mission "they called for artillery support" - reenforcement