[n] 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"
[n] an act performed to strengthen approved behavior
[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] (psychology) a stimulus that strengthens or weakens the behavior that produced it
[n] information that makes more forcible or convincing; "his gestures provided eloquent reinforcement for his complaints"