monograde adjective 3noun 1forms 1 adjective3 •Of an oil: having a viscosity specified for a single temperature range. •Relating to students of the same grade level. •Belonging 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). noun1 •An oil having a viscosity specified for a single temperature range. formsmonogrades