'assentation' originates from Latin, specifically the word 'assentatio', where the prefix 'ad-' (assimilated to 'as-') meant 'to/toward' and 'sentire' meant 'to feel' or 'to perceive'.

'assentation' came from Late Latin 'assentatio' and passed into Middle English (attested in forms like 'assentacioun' or 'assentation'), developing into the modern English noun 'assentation'.

Initially it referred chiefly to an 'expression of assent' or 'agreement', but over time it also acquired the sense of 'flattering or obsequious agreement' (praise given to secure favor).