Googolplex

[Magaret]

[Googolplex] is a really large number made up of [googol] and [plex].
googol is a made up word to mean 10 to the power of 100 or 1 with 100 zeroes after it.
[Plex] is plus exponent which means to the power of a positive number. (the alternative is minex, minus exponent which is to the power of a minus number)
so [googolplex] is 10 to the power of a googol, or 1 with a googol zeroes after it.

[Julene]

Equivalent to ten raised to the power of a googol.

[Monty]

the number ten to the power of a googol