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

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

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

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

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

(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.

Luxurious and expensive.

(US, slang, street slang) The police.

The neurotransmitter serotonin.

A day job, especially at a large company, emphasizing banality. / The workday itself (the period of the day between 9 am and 5 pm). / One who works in a job from 9 am to 5 pm.