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What is the plural of flatness?

What's the plural form of flatness? Here's the word you're looking for.

Answer

The noun flatness can be countable or uncountable.

In more general, commonly used, contexts, the plural form will also be flatness.

However, in more specific contexts, the plural form can also be flatnesses e.g. in reference to various types of flatnesses or a collection of flatnesses.

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Examples
Other paintings in the show juxtapose cinematic effects with sections that insist upon the obdurate flatness of the picture's surface.
The aluminum bands and rivets that comprise the work can only speak of the brushed surface or the inexorable flatness of the metal.
The floors were tested with a Dipstick to verify their overall flatness and levelness.
Long earth berms conceal cars and animate the pancake flatness of the suburban topography.
Only the concrete dividers separating the opposing lanes of traffic broke the utter flatness.
This water isn't going to run off quickly because of the flatness of this area.

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