IPA: /əˌsɛv.əˈreɪ.ʃən/
KK: /əˌsɛv.əˈreɪ.ʃən/
A serious statement or declaration that something is true or that you support something.
His asseveration of loyalty to the team was unwavering.
Asseveration is formed from "ad-" (meaning to) and "severare" (meaning to assert or affirm). The word describes the act of affirming something strongly or declaring it with emphasis.
Think of 'asserting' something strongly ('severare') as you 'add' to the conversation ('ad-'). This helps you remember that asseveration means a strong affirmation.