Definition of invest:
		
								
				"the contributors to the Wikipedia and Wiktionary projects have invested countless hours into this resource.."
			
			
	
		
		
		(n) :
		
		an unnamed tropical weather pattern "to investigate" for development into a significant (named) system.    A temporary designation by the U.S.  Joint Typhoon Warning Center and .  Internal jargon (possibly teletype abbreviation) in the 1980's.  Appears today on some tracking maps, e.g. tropical storm advisories at the .  Designation, e.g. 91e, is a cyclic number (90-99) and a letter suffix for oceanic region: