nine

A2 · Elementary Countable noun

n. the written symbol or figure 9.

n. the graphic symbol or digit representing the number nine.

日本語:九※

“The house number was a large brass nine fixed to the gate.”

“The accountant noticed that the nine in the final column had been smudged, making the total difficult to verify.”

C1 · Advanced Plural noun Computing Technical

n. a way to measure how reliable a computer system is, using the number of nines in a percentage.

n. a statistical unit of proportion used to express high levels of reliability or purity, such as 'five nines' for 99.999%.

日本語:ナイン※

“The company promises four nines of reliability for its cloud storage service.”

“Achieving five nines of uptime requires significant investment in redundant hardware and automated failover protocols.”

B2 · Upper Intermediate Countable noun Sports American English · Informal

n. a name for a baseball team, because there are nine players on the field.

n. a metonymic reference to a baseball team or its starting lineup.

“The local nine won the championship game in the final inning.”

“The manager struggled to assemble a competitive nine after three of his star players were sidelined by injuries.”

C1 · Advanced Countable noun Slang

n. a type of handgun that uses nine-millimeter bullets.

n. a nine-millimeter semi-automatic pistol.

“The detective carried a nine in a holster under his jacket.”

“Ballistics experts confirmed that the rounds were fired from a standard nine found at the scene.”