(In both the 12-hour clock and the 24-hour clock) The start of the sixth hour of the day; 5:00 a.m. (05:00). / (Only in the 12-hour clock) The start of the eighteenth hour of the day; 5:00 p.m. (17:00).

(historical) A 5.9-inch artillery shell of the kind used by Germany in World War I.

The questions who, what, when, where and why, useful in gathering information and solving problems.

(informal, idiomatic) A request to receive a high five.

plural of cheater five

From 9 a.m. to 5 p.m.

A typical working day.

(US) A five-and-dime.

(US) A store selling inexpensive items. / (poker slang) Two pair, composed of fives and tens. / (poker slang) A five and a ten as a starting hand in Texas hold 'em.

Of a job, beginning at 9 a.m. and ending at 5 p.m., the usual office hours in many countries.