different between trepidatory vs trepidation

English

trepidatory (comparative more trepidatory, superlative most trepidatory)

That trepidates, or that causes trepidations.
- 1953, Charles Egerton Osgood, Method and Theory in Experimental Psychology
  Unfortunately, like Guthrie he has never given a formal statement of his principles, and it is therefore up to the reader to ferret out these things for himself — always a trepidatory procedure.
- 2003, Laurence Gardner, Realm of the Ring Lords
  This was all very good news for the Church bishops because the shapeshifting werewolf had a limited trepidatory function, especially in places like England where wolves were generally unknown, although some existed then to the north in Scotland.
Of an earthquake, having a vertical, up-and-down motion, as opposed to a horizontal, side-to-side motion.
- 1843, Captin Sir Edward Belcher RN, Narrative of a Voyage Round the World
  This [earthquake] was felt at Mexico at precisely the same hour, lasting there about one minute and a half, the motion there being undulatory, but at Acapulco trepidatory.
- 1882, Knowledge, volume 1
  The most severe shock lasted for 70 seconds, and combined oscillatory, trepidatory, and rotatory movement.
- 1995, Elena Poniatowska, Aurora Camacho de Schmidt and Arthur Schmidt, Nothing, Nobody: The Voices of the Mexico City Earthquake
  The particular trepidatory and oscillatory patterns arising from the lake bed especially afflicted high-rise buildings between six and fifteen stories.

Borrowed from Latin trepid?ti?, from trepid? (“be agitated”)

trepidation (countable and uncountable, plural trepidations)

A fearful state; a state of concern or hesitation.
Synonyms: agitation, apprehension, consternation, fear, hesitation, worry
- 1929, M. Barnard Eldershaw, A House Is Built, Chapter VII, Section vi
  She opened the drawing-room door in trepidation. Would she find Esther drowned with her head in the goldfish bowl, or hanged from the chandelier by her stay-lace?
An involuntary trembling, sometimes an effect of paralysis, but usually caused by terror or fear; quaking; quivering.
(astronomy, obsolete) A libration of the starry sphere in the Ptolemaic system; a motion ascribed to the firmament, to account for certain small changes in the position of the ecliptic and of the stars.

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