enumerator

n. one that counts or numbers, one that lists; census taker

In computer science, an iterator is an object which allows a programmer to traverse through all the elements of a collection, regardless of its specific implementation. An iterator is sometimes called a cursor, especially within the context of a database.
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Noun
1. someone who collects census data by visiting individual homes
(synonym) census taker
(hypernym) official, functionary
(derivation) count, number, enumerate, numerate

(n.)
One who enumerates.
  

enumerator /i,nju:məreitə/
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