D defs.my
Entry 1 sense Webster, 1913

Assentation

· As·sen·ta·tion · IPA
01 n. Insincere, flattering, or obsequious assent; hypocritical or pretended concurrence.
  1. 1.
    Insincere, flattering, or obsequious assent; hypocritical or pretended concurrence.
    “Abject flattery and indiscriminate assentation degrade as much as indiscriminate contradiction and noisy debate disgust.” — Ld. Chesterfield.