Definition of guesstimate noun from the Oxford Advanced Learner's Dictionary

 

guesstimate

 noun
(also guestimate)noun
BrE BrE//ˈɡestɪmət//
 
; NAmE NAmE//ˈɡestɪmət//
 
(informal)
 
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an attempt to calculate something that is based more on guessing than on information More Like ThisBlended or portmanteau wordsalcopop, breathalyser, bromance, brunch, chillax, chugger, docusoap, edutainment, greenwash, guesstimate, infomercial, mechatronics, metrosexual, mockney, motel, multiplex, pleather, podcast, robocall, simulcast, sitcom, smog, staycation, telethon, televangelist, workaholic See worksheet. Word Origin 1930s (originally US): blend of guess and estimate.
See the Oxford Advanced American Dictionary entry: guesstimate