A million, million, millions... as in:
1, 000,000, 000,000, 000,000 or 10^18
...from tri as in three.
It is lazily commonly missused for a million millions, which is in fact a billion, from bi as in two (...and not a thousand million).
You see, a tricycle does not have two wheels and a bicycle does not have one and a half wheels.

Got the covid-19 vaccine

Used in as a metaphor for "a lot".

Sorry, the above definition is a little off. Actually, make that 999 billion off. A trillion is ten to the TWELFTH power (1,000,000,000,000). Ten to the ninth power is one billion.

Getting into a basketball game for one minute and not recording a single statistic. The line of the box score would have a 1 followed by 13 zeros.

(V) meaning too true and too real to be measured by any scale we know today. This word is scantly used.

1. Noun: A person who fully embodies the trill philosophy. (plural: trillions)
2. Proper Noun, plural (Trillions/Trillion$): An underground rap group from the Dirty West.