1. Impeccably clean; spotless: "The room was as spare and immaculate as a monk's cell" (Caroline Preston).
2. Free from sin.
3. Free from fault or error: an immaculate record on the job.
4. Biology Having no spots or marks.
[Middle English immaculat, from Latin immaculātus : in-, not; see IN-1 + maculātus, past participle of maculāre, to blemish (from macula, spot).]
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.