Metric unit equal to 100 square meters (3)

I believe the answer is:

are

(Other definitions for are that I've seen before include "(We/you/they) exist" , "(They/you/we) exist" , "Unit of land measure equal to 100 square metres" , "Is, in the plural" , "Exist; square measure" .)

I've seen this clue in The New York Times.

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