reinforcement

(noun) a military operation (often involving new supplies of men and materiel) to strengthen a military force or aid in the performance of its mission. Synonyms: support, reenforcement. Example: "They called for artillery support."

(noun) information that makes more forcible or convincing. Synonyms: reenforcement. Example: "His gestures provided eloquent reinforcement for his complaints."

(noun) (psychology) a stimulus that strengthens or weakens the behavior that produced it. Synonyms: reinforcing stimulus, reinforcer.

(noun) a device designed to provide additional strength. Synonyms: strengthener. Examples: "The cardboard backing was just a strengthener." "He used gummed reinforcements to hold the page in his notebook."

(noun) an act performed to strengthen approved behavior. Synonyms: reward.