I. i-ˈra-tik adjective
Etymology: Middle English, 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
erratic dieting
keeps erratic hours
b. : deviating from what is ordinary or standard : eccentric
an erratic genius
Synonyms: see strange
• er·rat·i·cal -ti-kəl adjective
• er·rat·i·cal·ly -ti-k(ə-)lē adverb
• er·rat·i·cism -ˈa-tə-ˌsi-zəm noun
II. noun
Date: circa 1623
: one that is erratic ; especially : an erratic boulder or block of rock