undercountDefinition of undercount verb Pronunciation: /ʌndəˈkaʊnt/ [with object] enumerate (something, especially a sector of a population in a census) at a lower figure than the actual figure: they have been accused of undercounting the homeless Baltimore’s population was undercounted by about 36,000 people noun Pronunciation: /ˈʌndəkʌʊnt/ a count or figure that is inaccurately low: an undercount would thwart this progress the amount by which an undercount falls short of the actual count or figure: other states had significantly larger undercountsundercount in other Oxford dictionaries Definition of undercount in the US English dictionary