1. topcode - Noun
2. topcode - Verb
topcode (plural topcodes)
(US) An upper income threshold beyond which census responses are censored, to prevent very wealthy individuals from being identified by their income.
topcode (third-person singular simple present topcodes, present participle topcoding, simple past and past participle topcoded)
(US, transitive) To censor a census response in this way.