English Etymology From ego + -ity. Noun egoity (countable and uncountable, plural egoities) personality January 13, 2011, Jonathan Swift, The Tatler Volume V No. 1 This innocent imposture […] by being mentioned in one of my papers, effectually recovered my egoity out of the hands of some gentlemen who endeavoured to wrest it from me. existence as an individual; selfnessWikiwand - on Seamless Wikipedia browsing. On steroids.