To make sure or certain; to render confident by a promise, declaration, or other evidence.
- To inform positively, as to remove doubt: assured us that the train would be on time.
- To cause to feel sure: assured her of his devotion.
- To give confidence to; reassure.
- To make certain; ensure: "Nothing in history assures the success of our civilization” ( Herbert J. Muller).
- To make safe or secure.
- Chiefly British To insure, as against loss.