Main Entry: [1]er·rat·ic
Pronunciation: i-'ra-tik
Function: adjective
Etymology: Middle English, from Middle French or Latin; Middle French erratique, from Latin erraticus, from erratus, past participle of errare
Date: 14th century
1 a : having no fixed course : WANDERING <an erratic comet> b : archaic : NOMADIC
2 : transported from an original resting place especially by a glacier <an erratic boulder>
3 a : characterized by lack of consistency, regularity, or uniformity b : deviating from what is ordinary or standard : ECCENTRIC <an erratic genius>
- er·rat·i·cal /-ti-k&l/ adjective
- er·rat·i·cal·ly /-ti-k(&-)lE/ adverb
- er·rat·i·cism /-'a-t&-"si-z&m/ noun
Rack,yes erratic is a word, but erraticness is not.