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Function: transitive verb

Inflected forms: pre•poned; pre•pon•ing

Etymology: Latin preponere to place before, prepone, from pre- + ponere to place -- more at POSITION

Date: Has been in use in urban English spoken in India since at least the 1950s

To advance an event or activity to an earlier time. The closest American usage is “to advance” the timing of something. The word came into vogue in urban India as the opposite of “postponing” something.
“To make sure we get to enjoy the fireworks display that starts promptly at 9 PM, let us prepone the dinner engagement to 7 rather than 8 tomorrow evening
prepone by Nik Dholakia August 21, 2006

prepondiculous 

Similar to ridonkulous, a combination of preposterous and ridiculous. Possibly originated in the webcomic Wondermark.
Ex. 1:

Man 1: Oh, yeah, we don't say ridonkulous anymore. It isn't cool.
Man 2: THAT'S PREPONDICULOUS.
Man 1: ...

Ex. 2:

Dude, did you hear about how Stacy is going out with Mark again? It's prepondiculous.
prepondiculous by Dee-Lawn December 28, 2007

preponderant 

Predominant, but specifically in terms of pondering instead of dominating. Something which has a monopoly or superior influence on your thoughts or senses, even though other things of the same type might exist.
The humans trapped in the Matrix were mostly unaware that the preponderant universe they experienced was digital.

To most people these days, Tiger Woods is the preponderant golfer.

The preponderant city shrouded its population in a blanket of smog, allowing them to forget that other cities even existed.
preponderant by Bloopy March 10, 2008
Function: transitive verb
Inflected Form(s): pre·poned; pre·pon·ing
Etymology: Latin preponere to place before, prepone, from pre- + ponere to place -- more at POSITION
Date: circa 2003, Providence RI
1 : to put off to an earlier time : pre-DEFER
2 a : to place earlier (as in a sentence) than the normal position in English <prepone an adjective> b : to place earlier in order of precedence, preference, or importance.
Jonas, Peter and Rowena scheduled a meeting for 11:00, but Sam preponed it to 10:00 due to an impending etymology debate.
prepone by Peter Wyner September 11, 2003
It's the opposite to postponed. When one has made an appointment and needs to make it earlier rather than later.
Hi Peter, Can we "prepone" our 5pm meeting today to 3pm? I have another engagement that has come up.
prepone by Emjonno May 17, 2009

Preponement 

This is the antithesis of postponement where you consciously do something ahead of when it is needed.
Today I am using preponement to get ahead of myself for no particular reason, just to clear the decks for a better tomorrow.
Preponement by Nountinence January 7, 2022