"Define Prophesy"
Sure - no problem, y'all.
Prophesy is a temporary spiritual enablement which enables a person to speak, generally in the common tongue, a message directly FROM God communicated by the Holy Spirit to one's MIND. The person delegated by God to prophesy will sense a "Burden" to deliver the Word, AND the beginning phrases of the message itself. WHen the time is right, the person will speak the words that he has, in the faith that more of the message will flow. the speaker will speak the words as supplied by the Holy Spirit are spoken to the intended audience until the message/utterance is complete.
Then the "burden" wil be gone, and the one speaking the prophesy should be quiet, and not ADD to the word from his own personal feelings.
The SUBJECT of the Prophetic utterance may be "Foretelling", but is more generally "Forthtelling". It'll generally be Exhortation, Correction, Word of Wisdom, Word of Knowledge, Discernation of Spirits, Spiritual insights to Scripture - in fact ANY SPOKEN gift fits under the category of Prophetic utterance.
When Jesus says: (Mark 13:11) But when they shall lead you, and deliver you up, take no thought beforehand what ye shall speak, neither do ye premeditate: but whatsoever shall be given you in that hour, that speak ye: for it is not ye that speak, but the Holy Ghost.
He's describing a "Prophetic Ministry".
Simple as that.