Chad (slang) definition

(1) A family of Afroasiatic tonal languages (mostly two tones) spoken in the regions west and south of Lake Chad in north central Africa

(2) A landlocked desert republic in north-central Africa; was under French control until 1960

(3) A lake in north central Africa; fed by the Shari river

(4) A small piece of paper that is supposed to be removed when a hole is punched in a card or paper tape