diffusion index
noun[C]
ukusECONOMICS
thedegreeto which differenteconomicindicators(=measurementsofeconomicactivity)arechangingin the same way at aparticulartime:
March'sdiffusionindexsuggestedJapan'srecoverywaslosingsteam.
FINANCE,STOCK MARKET
ameasureof thepercentageofsharesthat haveincreasedinvalueover aparticularperiodoftime