noun.
Belonging to the day preceding the present; next before the present: used in the compounds given below, and rarely, by license, as a quasi-adjective.
the GNU version of the Collaborative International Dictionary of English
adjective.
Last; last past; next before; of or pertaining to yesterday.
adverb.
Last; last past; next before; of or pertaining to yesterday.
Word Usage
"While Far Cry 2 goes to extraordinary effort to animate and portray you as a character to the best of current technical limitations, Fallout 3 reflects a character design aesthetic stuck in yester-year that doesn’t seem to mind stilted and jerky animations."