Definitions for oliverˈɒl ə vər
Random House Webster's College Dictionary
Ol•i•verˈɒl ə vər(n.)
one of Charlemagne's paladins.
Oliver, Joseph Oliver, King Oliver(noun)
United States jazz musician who influenced the style of Louis Armstrong (1885-1938)
Origin: Olivier, by folk etymology shaped to look like Late Latin olivarius, but probably representing a West form of Óleifr (modern Olaf and Olof), or ala- + wēraz (modern Alvar, Álvaro). Name of a paladin of Charlemagne in medieval French romance.
The Nuttall Encyclopedia
a favourite paladin of Charlemagne's, who, along with Roland, rode by his side, and whose name, along with Roland's, has passed into the phrase, a "Roland for an Oliver," meaning one good masterstroke for another, such as both these knights never failed to deliver.