The term

**JERK** was used by J. S. Beggs in 1955 in *Mechanism* iv.
122: "Since the forces to produce accelerations must arise from strains
in the materials of the system, the rate of change of acceleration, or
jerk, is important" (OED2).

**JORDAN CURVE** appears in "On the Existence of the Green's Function
for the Most General Simply Connected Plane Region," W. F. Osgood, *Transactions
of the American Mathematical Society,* Vol. 1, No. 3. (Jul., 1900):
"By a *Jordan curve* is meant a curve of the general class of continuous
curves without multiple points, considered by Jordan, *Cours d'Analyse,*
vol. I, 2d edition, 1893..." (OED2).

**JORDAN CURVE THEOREM** is dated 1915-20 in RHUD2.

The term is found in K. Venkatachaliengar, "A simple proof of the Jordan-curve
theorem," *Quart. J. Math.,* Oxford Ser. 8, 241-244 (1937).