
Linguistics in general and Indo-European linguistics in particular arose with the comparison of the lexicon, grammar, and texts of older languages. A group of nineteenth century scholars now known as the Neogrammarians formulated rules of sound correspondence that led to the view that "laws" of sound change are nearly as regular a phenomenon in language as the law of gravity is for physical world.
Indo-European phonology has now evolved to include identification of phonemic segments, root structure, and hypotheses concerning laryngeal and glottalic consonants.
For years IE grammar was primarily confined to issues of IE morphology. In recent decades IE grammar has come to include various aspects of syntax, including syntactic typology.
Now as from earliest times, the PIE lexicon is fundamental. Here it is the focus of three major sections, the Semantic Fields family of pages, the PIE Roots family of pages, and the family of pages relating to PIE Phonemes.
See also: Language Classification