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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).]