The noun flat has 7 senses (first 2 from tagged texts)
1. (2) flat -- (a level tract of land; "the salt flats of Utah")
2. (1) flat -- (a shallow box in which seedlings are started)
3. flat -- (a musical notation indicating one half step lower than the note named)
4. flatcar, flatbed, flat -- (freight car without permanent sides or roof)
5. flat, flat tire -- (a deflated pneumatic tire)
6. flat -- (scenery consisting of a wooden frame covered with painted canvas; part of a stage setting)
7. apartment, flat -- (a suite of rooms usually on one floor of an apartment house)
Overview of adj flat
The adj flat has 17 senses (first 5 from tagged texts)
1. (12) flat, level, plane -- (having a surface without slope, tilt in which no part is higher or lower than another; "a flat desk"; "acres of level farmland"; "a plane surface"; "skirts sewn with fine flat seams")
2. (6) flat -- (having a relatively broad surface in relation to depth or thickness; "flat computer monitors")
3. (2) categoric, categorical, flat, unconditional -- (not modified or restricted by reservations; "a categorical denial"; "a flat refusal")
4. (2) flat, prostrate -- (stretched out and lying at full length along the ground; "found himself lying flat on the floor")
5. (1) flat -- (lacking contrast or shading between tones)
6. flat -- (lowered in pitch by one chromatic semitone; "B flat")
7. compressed, flat -- (flattened laterally along the whole length (e.g., certain leafstalks or flatfishes))
8. bland, flat, flavorless, flavourless, insipid, savorless, savourless, vapid -- (lacking taste or flavor or tang; "a bland diet"; "insipid hospital food"; "flavorless supermarket tomatoes"; "vapid beer"; "vapid tea")
9. bland, flat -- (lacking stimulating characteristics; uninteresting; "a bland little drama"; "a flat joke")
10. flat -- (having lost effervescence; "flat beer"; "a flat cola")
11. flat, fixed -- ((of taxes) not increasing as the amount taxed increases)
12. flat, monotone, monotonic, monotonous -- (sounded or spoken in a tone unvarying in pitch; "the owl's faint monotonous hooting")
13. flat -- (horizontally level; "a flat roof")
14. two-dimensional, 2-dimensional, flat -- (lacking the expected range or depth; not designed to give an illusion or depth; "a film with two-dimensional characters"; "a flat two-dimensional painting")
15. flat -- ((of a tire) completely or partially deflated)
16. flat, mat, matt, matte, matted -- (not reflecting light; not glossy; "flat wall paint"; "a photograph with a matte finish")
17. flat -- (commercially inactive; "flat sales for the month"; "prices remained flat"; "a flat market")
Overview of adv flat
The adv flat has 2 senses (no senses from tagged texts)
1. flat -- (with flat sails; "sail flat against the wind")
2. directly, flat, straight -- (in a forthright manner; candidly or frankly; "he didn't answer directly"; "told me straight out"; "came out flat for less work and more pay")