101(redirected from 101 AD)
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Elementary; basic: You should never leave your baby alone in the bathtub—that's just parenting 101.
[From the common use of the number 101 to designate introductory-level courses at universities and colleges.]
comprising the introductory material in or as if in a course of study (used postpositively): Economics 101; Life 101; It's Jungle 101 on a trip up the Amazon.