All 4 Uses

census
in
The Pianist
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Perkowski had to find a tenant in the next few days, if only because the Germans had announced a census which would entail a police search of all homes to see if the occupants were properly registered and had a right to live there.†
Chpt 13

census = an official count of a population
We discussed how I was to be fed and how I should manage about the census when it took place next day.†
Chpt 13 *
Even if the Germans broke into the flat during the census, we concluded that they would be unlikely to notice the small door behind which I was hiding.†
Chpt 13
The idea of the census was to allow the Germans to track down all Jews hiding in Warsaw in one fell swoop.†
Chpt 13

Definitions:

(1) (census)
an official count of a population (often accompanied by collection of other data)
(2) (meaning too rare to warrant focus)