eldicka'u fu'ivla

x1 is measures equal to/is an elementary negative electric charge [-e; negative of the charge of the proton, id est the charge of the electron] in electric charge, under signum convention x2 (default: proton charge is -1 times this unit).

The number is negative. Approximately equal to: -1.602176565(35)×10-19 coulombs. Attention: the standard English unit is positive (opposite of this Lojbanic version). See also ".ocnerta", "dikca", "ku'arkydicka'u".

In notes:

ku'arkydicka'u
x1 is measures equal to/is a quantum negative electric charge [-e/3; electric charge of a down quark] in electric charge, under signum convention x2 (default: proton has charge equal to -3 times this unit).
tcaxe
x1 (object) has charge x2 (number) in units x3 for interaction/of type x4 and in/by/using convention x5
ocnerta
x1 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 x2, applicable under conditions/in universe/in metaphysics x3
kuardicka'u
x1 is measures equal to/is a quantum negative electric charge [-e/3; electric charge of a down quark] in electric charge, under signum convention x2 (default: proton has charge equal to -3 times this unit).