Top Definition
Noun. rash-un-all-ship
1. A sound, rational emotional involvement

2. A reciprocal connection that is free from the following possible side effects of a Relationship: drama, hang-ups, indecision, apathy, cheating, unrest/irritability, irregular bleeding, weight gain/loss, hair loss, STDs, unexpected pregnancy, drug addiction, workaholism, stalking, mood swings, mania, depression, gossip, job loss, irrational geographic relocation, marginalization, loss of skin elasticity or various personal belongings and dignity.

3. Evolutionary stage of human connection and/or personal development which follows the earlier relationship stage
I started dating my smart, healthy, hot, and available good friend of six years when I was 33 and thus began my first Rationalship.
by Rational Person June 14, 2012
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