IPA: /əˈʃʊərəns/
KK: /əˈʃʊərəns/
A promise or guarantee that something will happen or be true, which helps to build confidence and reduce doubt.
She gave her assurance that the project would be completed on time.
Assurance is formed from "assurer" (from Old French, meaning to make safe or secure) and the suffix "-ance" (indicating a state or quality). The word "assurance" refers to the state of being assured or having confidence in something.
Think of being made 'safe' or 'secure' ('assurer') and the state of that feeling ('-ance'). This helps you remember that assurance means having confidence or certainty.