that which causes another to revolve, rotate or oscillate; an oscillator.

repeating by itself; recurring.

revolving; rotating; rotary.

a man or thing that interrupts.

an apparatus for interrupting e.g. for breaking an eclectic circuit, for preventing the firing of a gun from an aircraft; an interrupter.

causing or tending to cause, obstruction; obstructing.

the time required by a pendulam for an oscillation; period of oscillation.

a decimal fraction in which after certain point one figure or group of figures is repeated to infinity; (e.g. ⅓ = 0.3333….333333).

a table of chemical elements in order of atomic number arranged in a horizontal series and vertical groups, showing how similar properties recur at regular intervals; a periodic table.