Genocide

Genocide (depends)
 * 1) a word with so many meanings to so many people, that its real meaning is as elusive as its existence as a word
 * seriously, can a word have meaning if it doesn't exist?
 * it's kinda like those French words, that might mean something if you're French, but then has no meaning if you're a regular person

Usage in a sentence
 * How do you spell genocide?