I. noun
or dop·pel·gang·er also dop·pel·gaeng·er ˌdäpəlˈgaŋə(r), -geŋ-, ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷ ̷ ̷, G ˈdȯpəlˌgeŋər
( -s )
Etymology: German doppelgänger, from doppel- double + -gänger goer, from Middle High German gengære, from Old High German -gengeri, from gangan to go + -eri, -āri -er — more at gang
: a ghostly counterpart and companion of a person ; especially : a ghostly double of a live person that haunts him through life and is usually visible only to himself
II. noun
1. : double 2a(1)
2. : alter ego d
3. : a person who has the same name as another