challenge

noun

1.
a demanding or stimulating situation
arvethness back-breaking hardput upcall
2.
a call to engage in a contest or fight
becalling becleping challenging
Derived from:
challenge
3.
questioning a statement and demanding an explanation
Derived from:
challenge
4.
a formal objection to the selection of a particular person as a juror
Derived from:
challenge
5.
a demand by a sentry for a password or identification
Derived from:
challenge