1 [mass noun] the action or process of imposing something or of being imposed:the imposition of martial law
2a thing that is imposed, in particular an unfair or unwelcome demand or burden:I’d like to see you, if that wouldn’t be too much of an impositionsome see the law as an unwanted imposition on their lives
a tax or duty.
3 [mass noun] Printing the imposing of pages of type.
[count noun] a particular arrangement of imposed pages:samples of 16-page impositions
late Middle English: from Latin impositio(n-), from the verb imponere(see impose)
imposition in other Oxford dictionaries
Definition of imposition in the US English dictionary