Definition of "sui generis" []

• Being the only example of its kind; unique: "sui generis works like Mary Chesnut's Civil War diary” ( Linda Orr). (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "For three weeks of brilliant performance he is the character sui generis of Lee's army."