A couple is a pair of two people as boyfriend and girlfriend, boyfriend and boyfriend, girlfriend and girlfriend. A couple loves each other deeply and tell each other everything. Good couples don't lie to each other and tell each other how they feel, but bad couples can keep secrets from each other. A couple doesn't have any standard rules, it's just what works best for the two.

two to fifteen objects or ideas of the same sort.

two people who like or love each other

Perhaps the urban dictionary definition of couple should be

Couple:

1. two individuals sharing their tastebuds in medium rare steaks

2. Middle of the night national anthem delivered in smooth sleepy tones between two humans

3. A couple of bulldozers

4. A couple of cats is way too many cats

2 people, who canoodle, and have extreme amounts of PDA (NO MATTER WHO THEY ARE AROUND!)

Refers to TWO things
Few is not interchangeable
Few refers to 3 or more things

2 people who are together as a couple and in denial that they are in a relationship. This often means seeing each other alone and refusing to call it a date. Usually begins with going home early together after nights out and abandoning friends.