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So extremely old as seeming to belong to an earlier period.
The outfit my teacher wore resembled something a caveman would wear, making me realize it was archaic.
archaic by Yummy Pineapple Cheese. February 26, 2007

archaic victory

The above definition is mistaken. What the author is talking about is not an "archaic victory," but a Pyrrhic victory.
Tony Soprano would probably refer to a Pyrrhic victory as an archaic victory.
archaic victory by palaeologos January 18, 2008
A woman who arches her back rather than sticking her bum in the air whilst being shagged from behind.
I'd rather make my own sandwiches than go for a ride on an archback.
Archback by Jimmephray June 9, 2015
Archischa also known as Archi is a very smart girl. She most likely knows multiple languages and is active in her culture. She loves to read and study but also knows how to have a little fun. She can sing and her intelligence is extremely high. If you ask anybody about Archi they will probably say she is smart, pretty, and knows how to have a good time. She excels in class and will never procrastinate. Chances are if you know an Archi you may say she might be a bit of a mom sometimes but she really is a fun person.
Person 1: Do you know Archischa?
Person 2: Oh yeah! Archi? She’s cool I heard she’s really smart.
Person 1: Yeah she helped me with my homework!
Person 2: Wow she really is just the best!

Archaic Dildo 

A metal dildo used in the medieval times as a weapon and a tool
The old woman an Archaic Dildo to have fun

Archaic Trolling 

The act of trolling others with very old or old fashioned material or media. The material/media used can also tend to be very obscure to most people in the modern world. Archaic Trolls are considered very eclectic , and get their kicks thru the confusion their old and obscure material causes amongst their targets.
Repeatedly sending someone that old Bugs Bunny cartoon from WWII is considered Archaic Trolling.