leap second Definition

sidereal time, sidereal day, simple harmonic motion, ephemeris time, critical point, mean solar day, isocryme, moment of inertia, lapse rate, ordinal number, in proportion to, exponential distribution, sidereal year, centrode, solar day, quinible, apparent magnitude, relativistic mass, rheobase, isothermobath, time signal, coriolis force, foretime, prenominate, point of inflection, common year, civil time, first gear, agravic, supersalient, aftergame, periodic function, factor of proportionality, independent variable, lissajous figure, magnetic moment, triduan, accent mark, per centum, subitize, pythiad, bring forward, larmor precession, time exposure, irrevoluble, accumulation point, safety factor, unit of time, leap day, drive at, stationary point, on one hand, isochasm, isohel, diapente, joint probability, subsultory, trioctile, citigrade, zeptosecond, periodic event, pilot balloon, echometer, gear ratio, spring up, window of opportunity, periodoscope, glissette, rest mass, biquintile, interlapse, second gear, chronaxie, rheochord, cosmic time, absolute temperature, subduple, prevenance, cardinal number, untime, circumvolution, subordinate conjunction, inclavated, versor, lunicurrent, equitemporaneous, time of year, run to, original cost, isotach, tellurion, isothermobathic, terdiurnal, subsextuple, line of force, equimomental, aftercrop, universal time, intercurrence, absolute magnitude,