[chal-in-jer] 
| 1. | a person or thing that challenges. |
| 2. | Boxing. a boxer who fights a champion for his championship title. |
| 3. | Radio. interrogator (def. 2). |
| 4. | (initial capital letter, italics ) U.S. Aerospace. the second space shuttle to orbit and return to earth: exploded 1 1/2 min. after launch on Jan. 28, 1986, causing the death of all seven on board. |
[in-ter-uh-gey-ter] | 1. | a person who interrogates. |
| 2. | Also called challenger. Radio. a transmitter that emits a signal to trigger a transponder. |
| chal·leng·er (chāl'ən-jər) n.
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