[ -er/-est only ] -tt- level and smooth; having little or no height and not raised or round:

[ -er/-est only ] -tt- A drink that is flat has stopped bubbling:

[ -er/-est only ] -tt- If a tire is flat, the air has gone out of it so that it does not give the support it should:

[ not gradable ] complete and certain:

[ not gradable ] (esp. of an amount of money) not changing or varying:

music lower in pitch than a particular or the correct note

esp. Br an apartment:

something flat, esp. a tire that has lost its air, so that it does not give the support that it should:

The flat of the hand is the inside, level part of the hand with the fingers straight:

music a mark in written music showing that a note should be played a half step lower

[ -er/-est only ] -tt- in a level position, often against another surface:

[ not gradable ] completely, or to the greatest degree possible:

[ only after n, not gradable ] exactly:

COMMERCE, FINANCE if profits, sales, etc. are flat, they are not growing or increasing:

STOCK MARKET if the stock market is flat, the prices of shares are not rising or falling:

fixed and without any additional costs:

HR used to describe the structure of an organization in which there are not many different levels of employees between the top and the bottom:

UK PROPERTY a set of rooms for living in which are part of a larger building and which are usually all on one floor: