Meaning of the word tantamount in English

What does tantamount mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

tantamount

US /ˈtæn.t̬ə.maʊnt/
UK /ˈtæn.tə.maʊnt/

Adjective

equivalent in seriousness to; virtually the same as

Example:
His refusal to help was tantamount to a betrayal.
Ignoring the problem is tantamount to accepting it.