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

(informal) Relatively close to the 5′ end of a strand of DNA.

(military) The planning section of an Air Force staff. / (military) Vigilante supersonic attack aircraft.

(sports, skateboarding, snowboarding, skiing) Clipping of 540. (540° spin)

(biochemistry) A specially altered nucleotide end to the 5′ end of precursor messenger RNA and some other primary RNA transcripts as found in eukaryotes and caliciviruses, vital to creating mature messenger RNA which is then able to undergo translation.

(biochemistry, genetics) A nucleic acid strand which terminates at the chemical group attached to the fifth carbon in the sugar ring.

plural of 5 percenter

(psychology) The 2013 revision of the Diagnostic and Statistical Manual of Mental Disorders, published by the American Psychiatric Association.

(music) A meter of five quarter notes per measure.

plural of 5-K