(US) Powers reserved for the states under the 10th Amendment of the United States Constitution.

(UK) The Inland Revenue, formed in 1849 and dissolved in 2005 to form part of HMRC.

(linear algebra) A function of two arguments from the same vector space which maps onto a field of scalars, which acts like a linear form with respect to either one of its arguments when the other ...

simple past tense and past participle of jump rope