The attitude that society should be governed by an elite group of individuals WordNet 3.0 & Open English WordNet

Elitism is the belief or notion that individuals who form an elite—a select group of people perceived as having an intrinsic quality, high intellect, wealth, power, notability, special skills, or experience—are more likely to be constructive to society as a whole, and therefore deserve influence or authority greater than that of others. Wikipedia

Belief or attitude that some individuals, who form an elite, are those whose influence or authority is greater than that of others Wikidata

The belief that society should be governed by a small group of people who are superior to everyone else. OmegaWiki

The superior attitude or behaviour associated with an elite. Wiktionary