1 : having lost effervescence; "flat beer"; "a flat cola"
2 : flattened laterally along the whole length (e.g., certain leafstalks or flatfishes)
3 : lacking stimulating characteristics; uninteresting; "a bland little drama"; "a flat joke"
4 : 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"
adjectif
1 : (of a musical note) lowered in pitch by one chromatic semitone
adverbe
1 : with flat sails
nom
1 : a deflated pneumatic tire
2 : a suite of rooms usually on one floor of an apartment house
