From BiblePortal Wikipedia

King James Dictionary [1]

Pros'Perous, a. L.prosperus. Advancing in the pursuit of any thing desirable making gain or increase thriving successful as a prosperous trade a prosperous voyage a prosperous expedition or undertaking a prosperous man, family or nation a prosperous war.

The seed shall be prosperous the vine shall give her fruit.  Zechariah 8

1. Favorable favoring success as a prosperous wind.

Webster's Dictionary [2]

(1): ( a.) Being prospered; advancing in the pursuit of anything desirable; making gain, or increase; thriving; successful; as, a prosperous voyage; a prosperous undertaking; a prosperous man or nation.

(2): ( a.) Tending to prosperity; favoring; favorable; helpful.