2. plenteousness, copiousness, luxuriance, affluence. Plenty, abundance, profusion refer to a large quantity or supply. Plenty suggests a supply that is fully adequate to any demands: plenty of money. Abundance implies a great plenty, an ample and generous oversupply: an abundance of rain. Profusion applies to such a lavish and excessive abundance as often suggests extravagance or prodigality: luxuries in great profusion.