x_{1} is the momentum [vector] of x_{2} in frame of reference x_{3}

x_{1} can be a vector, e.g. four-vector. Might be pretty general in its semantic scope ("quantity of movement"); at the very least includes both Relativistic (four-vector) and Newtonian (three-vector) momentum (resp.: nejnimpetu, sirmpetu); might also encompass angular momentum (cnampetu, typically three-vector). See also nejni, nejnimpetu, sirmpetu, ocnerta, tcelerita, cnampetu

- cnampetu
- x
_{1}is the angular momentum [vector] of x_{2}in frame of reference x_{3}around point/axis of reference x_{4}. - nejnimpetu
- x
_{1}is the linear-momentum-energy-mass [four-vector] of x_{2}in frame of reference x_{3} - ocnerta
- x
_{1}is a physically-required conserved quantity in an ideal closed system such that it is associated with (Noetherian) symmetry/Hamiltonian-commuting observable/deterministic feature/law/property/aspect x_{2}, applicable under conditions/in universe/in metaphysics x_{3} - sirmpetu
- x
_{1}is the [probably spatial] linear momentum [vector] of x_{2}in frame of reference x_{3}