Definitions
1.AdjectiveRelating to students of the same grade level.
2.AdjectiveOf an oil: having a viscosity specified for a single temperature range.
3.AdjectiveBelonging to a certain conjugation class of verbs in Japanese or Old Japanese, so called due to their use of one vowel (grade or row on the gojūon chart).
4.NounAn oil having a viscosity specified for a single temperature range.