consolidate

(verb) unite into one. Example: "The companies consolidated."

(verb) make firm or secure; strengthen. Examples: "Consolidate one's gains." "Consolidate one's hold on first place."

(verb) bring together into a single whole or system. Example: "The town and county schools are being consolidated."

(verb) form into a solid mass or whole. Example: "The mud had consolidated overnight."

(verb) make or form into a solid or hardened mass. Example: "Consolidate fibers into boards."