Definition of Challenger in English:

Challenger

Syllabification: Chal·leng·er
Pronunciation: /ˈCHalənjər/

Entry from US English dictionary

A US space shuttle that exploded 1.5 minutes after launch on January 28, 1986, killing its crew of seven.

Definition of Challenger in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up