from The Century Dictionary and Cyclopedia
- n. A series which proceeds according to the ascending positive integral powers of a variable. Thus the series a0 + a1x + a2x + … + anx + … whose coefficients a are independent of x, is a power-series or integral series in x.
Sorry, no etymologies found.
One can remove them by normal ordering at each order of a power-series expansion in the coupling, but this still seems like a cheat.