Noun
e-grade (uncountable)
(Indo-European linguistics) In Proto-Indo-European linguistics, an ablaut form of a root characterised by the presence of the */e/ phoneme.
*bʰer- is the e-grade of the root meaning “to carry, bear”.
Synonym: full-grade
Coordinate terms: o-grade, zero-grade, lengthened grade
E-grade highways are the latest addition to Sri Lanka's road network. Source: Internet