(singular only) The list published annually by Fortune magazine of the 500 United States companies with the highest revenue. / (plural only) Collectively, the members of that list.

(physics) The naturally-occurring radioactive isotope of vanadium, ⁵⁰₂₃V, having twenty-three protons and twenty-seven neutrons; its half-life is 1.5 x 10¹⁷ years

(athletics) A long-distance running race over 5000 metres.

(of a thing) Being a complete mix; containing parts of many different origins. / (informal, of a person or animal, chiefly a dog) Having ancestry of many different origins; to be of mixed race or breed.

(countable, slang) A dog of miscellaneous ancestry; a mutt. / (uncountable, poker) A variety of draw poker in which 5s and 7s are wild cards.

(physics) A minor stable isotope of chromium, ⁵³₂₄Cr, having 24 protons and 29 neutrons; it amounts to about 9% of the element in nature

(physics) The only stable isotope of manganese, ⁵⁵₂₅Mn, having 25 protons and 30 neutrons

(physics) The major stable isotope of chromium, ⁵²₂₄Cr, having 24 protons and 28 neutrons; it amounts to about 84% of the element in nature

(physics) A minor stable isotope of chromium, ⁵⁴₂₄Cr, having 24 protons and 30 neutrons; it amounts to about 2% of the element in nature

Former designation of Nelarabine; a chemotherapy prodrug used in treatment of T-cell acute lymphoblastic leukemia.