A trillionth of something is a very small amount. To say that something is a trillionth of something is to say that it is very, very small.
The car is a trillionth of a mile away.
The number of stars in the sky is a trillionth of a million.
noun
one part in a trillion equal parts
Synonyms:
adjective
the ordinal number of one trillion in counting order
1
You are looking for a particle that will exist for one billion trillionth of a second before metamorphosing not just once but twice.
2
A picosecond is one trillionth of a second.
3
The picowatt is equal to one trillionth of a watt.
4
They're only the 4 trillionth company to do it.
5
The prefix pico , literally defined as one trillionth, is a minute fraction.
6
Maybe one part per billion Carbon, and some trillionth of C 14.