1. A state of alarm or dread; apprehension. See Synonyms at fear.
2. Archaic An involuntary trembling or quivering.
[Latin trepidātiō, trepidātiōn-, from trepidātus, past participle of trepidāre, to be in a state of confusion, from trepidus, anxious.]
trep′i·datious (-shəs) adj.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.