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"flat" is also used as a crossword clue. If that's what you saw, the answer is often apartment (9 letters).
Definitions
Level, smooth, without fizz, or lacking variation.
Word origin
From Middle English flat, a borrowing from Old Norse flatr (compare Norwegian and Swedish flat, Danish flad), from Proto-Germanic *flataz, from Proto-Indo-European *pleth₂- (“flat”); akin to Saterland Frisian flot (“smooth”), German Flöz (“a geological layer”), Ancient Greek πλατύς (platús), Latvian plats, Sanskrit प्रथस् (prathas, “extension”). Doublet of plat and pleyt.
Used in a sentence
“The land around here is flat.”
“a flat roof”
“The surface of the mirror must be completely flat.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer9 curated clues
01“Apartment, in London”4 letters
02“Even and level”4 letters
03“Level, as land”4 letters
04“Level, not sloped”4 letters
05“Not bumpy or curved”4 letters
06“Without fizz”4 letters
07“Without hills”4 letters
08“Without hills or bumps”4 letters
09“Level and not curved”4 letters
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