Sociological term defined as a person who's thoughts and ideas of you as a person effect you most greatly.
I really care what Karen thinks about my new life choices, so she is my Significant Other.
by a someewhat smart guy August 26, 2009
Get the Significant other mug.
when you're "dating" only one person, but the official title of boyfriend/girlfriend does not exist.
karen: so you and nick are dating?
me: no. he's my significant other.
karen: what's that?
me: we only see each other but we don't have the official title. i.e. he's my significant other.
by miss monique June 13, 2008
Get the significant other mug.
A significant other whose status is not created by a agreed-upon relationship status but by how much time is spent with them. Could also be considered a behavioral significant other.

Combination of "statistically significant" and "significant other."
Since he spent twice as much time with Karen as with any of the other girls he was dating, his friends called Karen his statistically significant other.
by Brett Lider February 5, 2009
Get the statistically significant other mug.
A significant other defined by an (undesired) medical condition, not by a agreed-upon relationship status.

Combination of "clinically significant" and "significant other."
They were only dating casually, but when he gave her the Clap, he became her clinically significant other.
by Brett Lider February 5, 2009
Get the clinically significant other mug.
A person with whom one shared a special relationship that is somewhat more than simply as friend, but not not quite the level of "significant other." May be former or future significant other, or even someone whom will never have that status. Some "best friends" qualify, but not nearly all do. A sexual component to the relationship is quite common, though it is not required.

Note: A sexual component does not automatically raise a friend to moderately significant other status, rather it is the strength of the bond between the two parties.
"I haven't had a girlfriend in a while, so I've been spending a lot of time with my moderately significant other, and we've even gone to a few weddings together. But somehow, we've never quite gone out."
by ceolaf2 September 1, 2009
Get the moderately significant other mug.
A person you are dating casually, but is potentially a keeper.
I thought you and Kimberly were monogamous.
Well, she is a semi-significant other, but we haven't committed to anything yet, so I'll keep trolling while I wait for her to get serious.
by Obscure One November 18, 2016
Get the Semi-significant other mug.