n. Excessive vanity, pride or arrogance; self-importance.
The Century Dictionary and Cyclopedia
n. An exaggerated egotism, amounting to an actual mental disorder.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. an intense and irresistible love for yourself and concern for your own needs
Word Usage
"His head was full of fantastic perversions as to the nature of duty, largely mingled with the signs of degeneracy, which in these days would be called egomania and megalomania."