Definition of del in US English:

del

noun

Mathematics
  • An operator used in vector analysis. (Symbol: ∇).

    del is defined as i∂/∂x + j∂/∂y + k∂/∂z, where i, j, and k are vectors directed respectively along the Cartesian axes x, y, and z

Origin

Early 20th century: abbreviation of delta, from the representation of the operator as an inverted capital delta.

Pronunciation

del

/del/