5′

Noun

 * 1) That end of any DNA strand that has a terminal phosphate group.

Adjective

 * 1)  Relatively close to the 5′ end of a strand of DNA.
 * 2) * 1992, James D. Watson et al., Recombinant DNA, second edition, Scientific American Books, ISBN 0716722828, page 147:
 * A CG pair is often designated CpG to signify that the two nucleotides are contiguous in DNA and that the C is 5′ to the G.