The overhead upper surface of a covered space.

Roget 206: height, altitude, elevation; eminence, pitch; loftiness etc. adj.; sublimity.    tallness etc. adj.; stature, procerity^†; prominence etc. 250.    colossus etc. (size) 192; giant, grenadier, giraffe, camelopard.    mount, mountain; hill alto, butte [U.S.], monticle^†, fell, knap^†; cape; headland, foreland^†; promontory; ridge, hog's back, dune; rising ground, vantage ground; down; moor, moorland; Alp; uplands, highlands; heights etc. (summit) 210; knob, loma^†, pena [U.S.], picacho^†, tump^†; knoll, hummock, hillock, barrow, mound, mole; steeps, bluff, cliff, craig^†, tor^†, peak, pike, clough^†; escarpment, edge, ledge, brae; dizzy height.    tower, pillar, column, obelisk, monument, steeple, spire, minaret, campanile, turret, dome, cupola; skyscraper.    pole, pikestaff, maypole, flagstaff; top mast, topgallant mast.    ceiling etc. (covering) 223.    high water; high tide, flood tide, spring tide.    altimetry etc. (angel) 244^†; batophobia^†.    satellite, spy-in-the-sky.    ... show more

Dutch: plafon, plafond, plafonnering
Polish: sufit

meteorology Altitude of the lowest layer of clouds.

An upper limit on what is allowed:
— He put a ceiling on the number of women who worked for him.

synonyms: cap, roof.

Roget 223: covering, cover; baldachin, baldachino^†, baldaquin^†; canopy, tilt, awning, tent, marquee, tente d'abri [Fr.], umbrella, parasol, sunshade; veil (shade) 424; shield etc. (defense) 717.    roof, ceiling, thatch, tile; pantile, pentile^†; tiling, slates, slating, leads; barrack [U.S.], plafond, planchment [U.S.], tiling, shed etc. (abode) 189.    top, lid, covercle^†, door, operculum; bulkhead [U.S.].    bandage, plaster, lint, wrapping, dossil^†, finger stall.    coverlet, counterpane, sheet, quilt, tarpaulin, blanket, rug, drugget^†; housing; antimacassar, eiderdown, numdah^†, pillowcase, pillowslip^†; linoleum; saddle cloth, blanket cloth; tidy; tilpah [U.S.], apishamore [U.S.].    integument, tegument; skin, pellicle, fleece, fell, fur, leather, shagreen^†, hide; pelt, peltry^†; cordwain^†; derm^†; robe, buffalo robe [U.S.]; cuticle, scarfskin, epidermis.    clothing etc. 225; mask etc. (concealment) 530.    peel, crust, bark, rind, cortex, husk, shell, coat; eggshell, glume^†.    capsule; sheath, sheathing; pod, cod; casing, case, theca^†; elytron^†; elytrum^†; involucrum [Lat.]; wrapping, wrapper; envelope, vesicle; corn husk, corn shuck [U.S.]; dermatology, conchology; testaceology^†.    inunction^†; incrustation, superimposition, superposition, obduction^†; scale etc. (layer) 204.    [specific coverings] veneer, facing; overlay; plate, silver plate, gold plate, copper plate; engobe^†; ormolu; Sheffield plate; pavement; coating, paint; varnish etc. (resin) 216.1; plating, barrel plating, anointing etc. v.; enamel; epitaxial deposition [Eng.], vapor deposition; ground, whitewash, plaster, spackel, stucco, compo; cerement; ointment etc. (grease) 356.    ... show more

Roget 210: summit, summity^†; top, peak, vertex, apex, zenith, pinnacle, acme, culmination, meridian, utmost height, ne plus utra, height, pitch, maximum, climax, culminating point, crowning point, turning point; turn of the tide, fountain head; water shed, water parting; sky, pole.    tip, tip top; crest, crow's nest, cap, truck, nib; end etc. 67; crown, brow; head, nob^†, noddle^†, pate; capsheaf^†.    high places, heights.    topgallant mast, sky scraper; quarter deck, hurricane deck.    architrave, frieze, cornice, coping stone, zoophorus^†, capital, epistyle^†, sconce, pediment, entablature^†; tympanum; ceiling etc. (covering) 223.    attic, loft, garret, house top, upper story.    [metaphorical use] summit conference, summit; peak of achievement, peak of performance; peaks and troughs, peaks and valleys (in graphs). ... show more

Dutch: zoldering

Maximum altitude at which a plane can fly (under specified conditions).

Polish: pułap