Fifth cranial nerve

What is Fifth cranial nerve?

Fifth cranial nerve definition and meaning on Dictionary terms:
next after the fourth; being the ordinal number for five.
being one of five equal parts.

Automotive. of, relating to, or operating at the gear transmission ratio at which the drive shaft speed is greater than that of fourth gear for a given engine crankshaft speed: fifth gear.

in the fifth place; fifthly.

a fifth part, especially of one (1/5).
the fifth member of a series.
a fifth part of a gallon of liquor or spirits; 4/5 (0.8) of a quart (about 750 milliliters).

Automotive. fifth gear.
Music. a tone on the fifth degree from another tone (counted as the first). the interval between such tones. the harmonic combination of such tones.