billionth

One over one-billion

Billionth describes the position at number one billion in a sequence, or one part when something is divided into a billion equal portions.

As a noun, a billionth is that fractional part: a billionth of a second.

In American usage, a billion is a thousand million; in older British usage, it was a million million—so billionth varies accordingly.

scale

nanometer

Metric unit, billion-fold smaller

nanoscaleBillionth-meter dimension
angstromSubatomic length unit
picometerTrillionth of a meter

nanotechnology · microscopic · molecular · atomic · subatomic · femtosecond · picosecond · attosecond · nanogram · miniaturization

insignificance

negligible

Too small to consider

trivialLacking significance or weight
inconsequentialLacking significance or impact
minusculeExtremely small in size

infinitesimal · imperceptible · undetectable · marginal · slight · minute · trace · sliver · speck · iota

fraction

numerator

Number being divided

denominatorFraction's bottom number
decimalTenths-based notation
percentageProportion out of hundred

ratio · proportion · divisor · quotient · half · third · quarter · tenth · hundredth · millionth

ordinal

sequence

Ordered succession of elements

rankPosition in hierarchy
positionLocation or stance
orderMethodical arrangement or request

placement · precedence · succession · series · nth · enumeration · indexing · following · preceding · subsequent

Categories

fractionshalf, halves, third, thirds, fourth
ordinalsfirst, second, third, fourth, fifth
tiny amountsbit, drop, hint, dash, dot
metric prefixeskilo, mega, giga, peta, milli
quantifiersall, any, every, each, both

Opposites

magnitude/scale in ordinal sequence

billionthfirst

Position number one

second · third · primary · initial · foremost

fractional size

billionthwhole

Full and undivided

entire · total · complete · all · full

Phrases

billion yearsThousand million revolutions around sun
billion years old
billion dollar club
billionaire romanceFiction where wealth meets desire
Texas billionaireUltra-rich Lone Star resident

Family

billions, billion, billionaire, billionaires, billionths

Familiarity: Top 100,000
Profile: Known to kids · Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G