The phrase "appointed term" means a specific and predetermined period or length of time set for someone's role, duty, or obligation. It is an agreed upon timeframe in which a task or responsibility must be completed or fulfilled. Full definition
Dog Psychologists are a self appointed term, as there aren't any formal degrees in dog psychology. (montrealdogblog.com)
And had it not been for a Word that went forth before from your Lord for an appointed term, the matter would have been settled between them. (religion.blogs.cnn.com)
We enjoyed one another, but now we have arrived at the appointed term which Thou appointedst for us. (religion-online.org)