Question

what is meant by the term base pairing

Answer 1

In DNA, it means that the base A is paired with T and the base G is paired with C
In RNA, it is A with U and T with G

http://ghr.nlm.nih.gov/glossary=basepair

Answer 2

It is referring to the pairing between the anti-parallel strands of DNA/RNA in double-stranded DNA/RNA.

Answer 3

I think it is the term used to describe the hydrogen bonding of purines to pyramidines (bases).Its definition is posted by user nincompoop.... Thank you.