| noun | a demanding or stimulating situation “they reacted irrationally to the challenge of Russian power” |
| noun | a call to engage in a contest or fight |
| noun | questioning a statement and demanding an explanation “his challenge of the assumption that Japan is still our enemy” |
| noun | a formal objection to the selection of a particular person as a juror |
| noun | a demand by a sentry for a password or identification |
| verb | take exception to “She challenged his claims” |
| verb | issue a challenge to “Fischer challenged Spassky to a match” |
| verb | ask for identification “The illegal immigrant was challenged by the border guard” |
| verb | raise a formal objection in a court of law |
| challenge | verb | issue a challenge to |
| challengeable | adjective | capable of being challenged |
| challenge | noun | questioning a statement and demanding an explanation |
| dispute | noun | a disagreement or argument about something important |
| disputation | noun | a contentious speech act; a dispute where there is strong disagreement |
| challenger | noun | the contestant you hope to defeat |