Definition of bourses:
(n) :
A stock exchange.
(n) :
(figuratively) Any place, real or imagined, where the value of a thing is settled.
(n) :
(philately) A meeting of stamp collectors and/or dealers, where stamps and covers are sold or exchanged.
(n) :
(botany) The swollen basal part of an inflorescence axis at the onset of fruit development; it bears leaves whose axillary buds differentiate and may grow out as shoots.