Roget's Thesaurus of English Words and Phrases by Peter Mark Roget

&c 204; dead level, dead flat; level plane. recumbency, lying down &c v.; reclination†, decumbence†; decumbency†, discumbency†; proneness &c adj.; accubation†, supination†, resupination†, prostration; azimuth. plain, floor, platform, bowling green; cricket ground; croquet ground, croquet lawn; billiard table; terrace, estrade†, esplanade, parterre. [flat land area] table land, plateau, ledge; butte; mesa (plain) 344. [instrument to measure horizontality] level, spirit level. V. be horizontal &c adj.; lie, recline, couch; lie down, lie flat, lie prostrate; sprawl, loll, sit down. render horizontal &c adj.; lay down, lay out; level, flatten; prostrate, knock down, floor, fell. Adj. horizontal, level, even, plane; flat &c 251; flat as a billiard table, flat as a bowling green; alluvial; calm, calm as a mill pond; smooth, smooth as glass. recumbent, decumbent, procumbent, accumbent†; lying &c v.; prone, supine, couchant, jacent†, prostrate, recubant†. Adv. horizontally &c adj.; on one's back, on all fours, on its beam ends.