Completely flat; having absolutely no elevation change or angle.
Compound of 'dead' (meaning absolute or complete) + 'flat.' Uses 'dead' as an intensifier (similar to 'dead serious' or 'dead weight'), combined with 'flat' from Old Norse 'flatr,' meaning level.
Deadflat is the geography of the Great Plains and desert basins—so perfectly level that early travelers found it disorienting, and modern pilots love it. Sometimes total flatness is actually what you're searching for.
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