„Impost“

1. A tax, especially an import duty.

2. To classify an impost in order to fix the duty. (rarely used). (Note: an imposter is one who imposts. Another definition of an imposter is a “pretender” but that is not the meaning intended here.).)

Source:

McKercher, Patrick R., “International Trade Law: Understanding the International Commercial Terms”, Oxford University Press, 2010.