trillion

A trillion is 1,000,000,000,000, also know as 10 to the 12th power, or one million million. It’s such a large number it’s hard to get your head around it, so sometimes trillion just means “wow, a lot.”

A trillion is bigger than a million, more than a billion, it’s 1,000,000,000,000 (and even or 1,000,000,000,000,000,000 in some countries). (Yes, those are 18 zeroes in that last one.) Either way, this is such a large number that it's hard to imagine. Maybe that's why people often use this word in a looser sense, as in "I have a trillion reasons why I like this band!" That meaning is similar to gazillion, bazillion, and zillion, which aren't real numbers.

Definitions of trillion
1

n the number that is represented as a one followed by 12 zeros

“in England they call a trillion a billion”
Synonyms:
1000000000000, one million million
Type of:
large integer
an integer equal to or greater than ten

n the number that is represented as a one followed by 18 zeros

“in England they call a quintillion a trillion
Synonyms:
one million million million
Type of:
large integer
an integer equal to or greater than ten

n a very large indefinite number (usually hyperbole)

Synonyms:
billion, gazillion, jillion, million, zillion
Type of:
large indefinite amount, large indefinite quantity
an indefinite quantity that is above the average in size or magnitude

adj one million million in the United States

Synonyms:
cardinal
being or denoting a numerical quantity but not order

adj one quintillion in Great Britain

Synonyms:
cardinal
being or denoting a numerical quantity but not order