A demanding or stimulating situation;
From day one we human beings are challenged by life until our death. The word "challenge" is not a simple word but it is ambiguous in a certain sense.
Middle English borrowed chalenge from Old French. French chalenge came from Latin calumnia "trickery, false accusation", a noun based on the verb calvi "to deceive". So a challenge was originally a false accusation.
The sense of confrontation carried on but the general meaning of this word moved from a negative to a positive sense somewhere along the way between Latin and English. http://www.alphadictionary.com/goodword/
This Impatient plant has found itself a challenge growing from a crevice where the seed has lodged itself. It battles other challenges like being eaten by voracious grasshopper who likes its tender green leaves
The goldfish in the pond face every day the challenge to escape being a meal to a silver gray heron. I have made them hide away places to give the challenged fish a chance to escape.
Are you facing any challenges at the moment?