Terra firma
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">terra firma</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that terra firma can be written as land)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for land that I've seen before include "part of surface" , "Come down; territory" , "Lift with ropes and pulleys" , "Terrain" , "people" .)
(Other definitions for earth that I've seen before include "Land" , "Terrestrial sphere" , "Lair; planet" , "underground shelter" , "Familiar example of 1 Across" .)
(Other definitions for ground that I've seen before include "See 14" , "foundation course?" , "The solid surface of the Earth" , "Pulverised; earth" , "Oval, for example" .)