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1.
When two people go out as friends, but one or both parties harbour feelings for the other. Such meetings are used to gauge one's feelings for the other, and usually precede the first date.
William likes Kate. William and Kate regularly meet up as friends and both enjoy each other's company. William slowly develops feelings for Kate. These meetings are known as "pre-dates" and this period is known as "pre-dating".

After which, William and/or Kate propose to go on their first date.
by J F M February 20, 2014
 
2.
Not quite a date, where you go out with a person you might be interested in dating and they're totally interested (or vice versa), that you've previously met during an activity where you maybe weren't yourself (e.g. a waitress from a bar where you were totally hammered). A pre-date will normally occur at a location of one of the parties choice (generally the less interested one) where there are other people they know close by, in case the other person turns out to be a psycho (e.g. a serial rapist or axe murderer). First date activities can still happen on a pre-date (e.g. flirting, makeout, OTPHJ, etc.), but the date definitely does not count in any running total and will leave at least one of the parties clueless and looking forward to/nervous for the actual first date.
Andrew was really excited for his first date with An, until he found out the location was where her brother worked, making it a pre-date.
by ARCdotCOM September 16, 2009
 
3.
The initial informational-interview type meeting with someone met through an online dating service.

Typically involves a drink, right after work, during the week. Sometimes this psuedo-date can carry over into dinner if both parties are interested.
Fifi is getting tired of the same ol'pre-date format. She'd rather take a walk in the park.
by Flea Sisters July 16, 2004
 
4.
Rhymes with rebate.

The act of looking up prospective dates on Facebook or some other social networking site for the sole purpose of masturbating while ogling his or her picture(s). A predater is one who predates.
If you ever predate my sister and I find out, I'm gonna kill you, you sick bastard. I'd never let her date a predate like you.
by Wurd Smithe October 19, 2009