tremulous fear, alarm, or agitation; perturbation.
trembling or quivering movement; tremor.

1595–1605; < Latin trepidātiōn- (stem of trepidātiō), equivalent to trepidāt(us) (past participle of trepidāre to hurry, alarm; see trepid, -ate1) + -iōn- -ion

trepidatious, adjective
trepidatiously, adverb

1. trembling, fright. 2. quivering, shaking. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trepidation (ˌtrɛpɪˈdeɪʃən)
1.  a state of fear or anxiety
2.  a condition of quaking or palpitation, esp one caused by anxiety
[C17: from Latin trepidātiō, from trepidāre to be in a state of alarm; compare intrepid]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1605, from L. trepidationem (nom. trepidatio) "agitation, alarm, trembling," noun of action from pp. stem of trepidare "to tremble, hurry," from trepidus "alarmed, scared," from PIE *trep- "to shake, tremble" (cf. Skt. trprah "hasty," O.C.S. trepetati "to tremble"), related to *trem- (see tremble).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

trepidation trep·i·da·tion (trěp'ĭ-dā'shən)

  1. An involuntary trembling or quivering.

  2. A state of anxious fear; apprehension.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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