- nutation (n.)
[nutation 词源字典]
- 1610s, "action of nodding," from Latin nutationem (nominative nutatio), noun of action from past participle stem of nutare "to nod," from PIE *neu- "to nod" (see numinous). Astronomical use is from 1715. Related: Nutational.[nutation etymology, nutation origin, 英语词源]