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From The Collaborative International Dictionary of English v.0.48:
Neogrammarian \Ne`o*gram*ma"ri*an\, n. [Neo- + grammarian; a translation of G. junggrammatiker.] One of a group of philologists who apply phonetic laws more widely and strictly than was formerly done, and who maintain that these laws admit of no real exceptions. -- Ne`o*gram*mat"ic*al, a. [Webster 1913 Suppl.]