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Douglas Harper's Etymology Dictionary
trillionth

1820, from trillion + -th (1).

Wiktionary
trillionth

a. The ordinal form of the number trillion. n. 1 The person or thing in the trillionth position. 2 One of a trillion equal parts of a whole

WordNet
trillionth
  1. adj. the ordinal number of one trillion in counting order

  2. n. one part in a trillion [syn: one-trillionth]

Wikipedia
Trillionth

One trillionth is the reciprocal of a trillion, which means it has one of two definitions depending on whether the long scale or short scale numbering system is in use.

Usage examples of "trillionth".

Scout D rocket from Wallops Island, Virginia, that carried an atomic clock accurate to about a trillionth of a second per hour.

This means that in a brief flicker of time, about a trillionth of a trillionth of a trillionth of a second ATB, the size of the universe increased by a greater percentage than it has in the 15 billion years since.

Computer photographs of this event, taken every trillionth of a secondalmost time enough to catch the space between atoms in a masswould show what had happened in detail.

In this way the dilution of the original millionth of a grain of medicine contained in the grain of powder operated on is carried successively to the billionth, trillionth, quadrillionth, quintillionth, and very often much higher fractional divisions.

But he should have remembered that at every successive dilution he lays aside or throws away ninety-nine hundredths of the fluid on which he is operating, and that, although he begins with a drop, he only prepares a millionth, billionth, trillionth, and similar fractions of it, all of which, added together, would constitute but a vastly minute portion of the drop with which he began.

Her calculations could not be off by so much as an angstrom, her timing by so much as a trillionth of a second, or she would destroy what she was setting out to save.

No one can explain how the rods of the eye can pick up light as faint as a trillionth of a watt.

And then, in less than a trillionth of a trillionth of a second, there was everything.

Exactly 2,017 trillionths of a second before reaching the boundary point, she issued the command to the warp engines to change their subspace field configuration slightly, to trigger the interspace jump back to her own universe, then waited as the command crawled out at light-speed through the optical network to the warp nacelles.

Mass migrated until, by the end of the process, a billion trillion years down the line, the star was a single crystal of iron crushed down into a sphere a few thousand kilometers in diameter, spinning slowly in a cold vacuum only trillionths of a degree above absolute zero.

For instance, in 1976 Robert Vessot and Martin Levine of the Harvard-Smithsonian Astrophysical Observatory, together with collaboraters at the National Aeronautics and Space Administration (NASA), launched a Scout D rocket from Wallops Island, Virginia, that carried an atomic clock accurate to about a trillionth of a second per hour.

In any sane universe, this would set up tidal stresses and tear the ship apart, and we would be just another million kilograms of degenerate matter on the theoretical surface, rushing headlong to nowhere for the rest of eternity or dropping to the center in the next trillionth of a second.

Our solar system may be the liveliest thing for trillions of miles, but all the visible stuff in it—the Sun, the planets and their moons, the billion or so tumbling rocks of the asteroid belt, comets, and other miscellaneous drifting detritus—fills less than a trillionth of the available space.

For the detonation of duodec is propagated at the velocity of light, so that the entire mass disintegrates in a period of time to be measured only in fractional trillionths of a second.

Exactly 2,017 trillionths of a second before reaching the boundary point, she issued the command to the warp engines to change their subspace field configuration slightly, to trigger the interspace jump back to her own universe, then waited as the command crawled out at light-speed through the optical network to the warp nacelles.