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Caliber is the American spelling of calibre. It first names the inner width of a gun barrel, or the size of the bullet that fits it — a .45-caliber pistol, a small-caliber rifle. From that, English also uses it for the “size” of a person or a piece of work, meaning how good they are. A scientist of the highest caliber is not wide; she is excellent. The gun sense is technical; the quality sense is common in news and school writing. British English calibre for both. The two spellings do not change the meaning; they only mark American versus British habit.
口徑；也指水準、才幹（美式拼法；英式作 calibre）
原始詞典資料8 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
calibernoun/ˈkæl.ɪ.bə(ɹ)/
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Diameter of the bore of a firearm, typically measured between opposite lands.
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The diameter of round or cylindrical body, as of a bullet, a projectile, or a column.
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A nominal name for a cartridge type, which may not exactly indicate its true size and may include other measurements such as cartridge length or black powder capacity. Eg 7.62×39 or 38.40.
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Unit of measure used to express the length of the bore of a weapon. The number of calibres is determined by dividing the length of the bore of the weapon, from the breech face of the tube to the muzzle, by the diameter of its bore. A gun tube the bore of which is 40 feet (480 inches) long and 12 inches in diameter is said to be 40 calibers long.
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Relative size, importance, magnitude.
- A snort of about the calibre of an explosion in an ammunition dump escaped my late father's sister.
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Capacity or compass of mind.
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datedDegree of importance or station in society.
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hobbieshorologylifestyleMovement of a timepiece.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。