“Vahl-a-dik-shun” | /ˌvæl.əˈdɪk.ʃən/
n – A speech made when leaving or parting company. A word or phrase (such as adieu or farewell) said upon leaving.
“Jane waited for his valediction, but his stormed out of house without a single word or wave goodbye.”
1614. Borrowed from Latin valedīcere, present active infinitive of valedīcō (“bid farewell”), from valē, imperative of valeō (“I am well”), + dīcō (“say”).