Imines bearing a hydrocarbyl group on the nitrogen atom $\ce{R2C=NR'}$ ($\ce{R'} \neq \ce{H}$). Considered by many to be synonymous with azomethines.
Source: PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1364 [Terms] [Paper]