Definitions
01a single thread
B2 · Upper Intermediate Countable noun American English
n. a single thin thread of a material like cotton, wool, or nylon.
n. a single elongated piece of material, typically cylindrical, which can be spun into yarn or thread.
“The detective found a tiny blue fiber from a sweater on the rug.”
“Forensic analysts identified a synthetic fiber caught in the door frame that matched the specific blend used in the suspect's jacket.”
Usage
Countable in this sense.
02dietary roughage
B2 · Upper Intermediate Uncountable noun Medicine American English
n. the part of food, like vegetables and grains, that helps your body digest.
n. indigestible carbohydrate derived from plants that aids in the passage of food through the digestive system.
日本語:食物繊維※
“You should eat more fruit and beans to get enough fiber in your diet.”
“Nutritionists recommend a high-fiber diet to maintain gut health and reduce the risk of chronic metabolic diseases.”
Usage
Usually uncountable when referring to the nutrient.
Synonyms
03biological tissue
C1 · Advanced Countable noun Science American English · Technical
n. a long, thin cell in your body, such as in a muscle or nerve.
n. an elongated, threadlike structure or cell found in animal or plant tissue.
“The athlete suffered a tear in a muscle fiber during the race.”
“Microscopic examination revealed that the nerve fibers were beginning to regenerate after the surgical intervention.”
04moral character
C2 · Proficiency Uncountable noun American English · Literary
n. the inner strength or character that makes a person do the right thing.
n. the essential character, nature, or moral strength of a person.
“Hard work and honesty were part of his moral fiber.”
“The crisis tested the very fiber of her being, forcing her to choose between personal gain and ethical duty.”
Teaching tip
Often used in the fixed phrase 'moral fiber'.
05computing thread
C2 · Proficiency Countable noun Computing American English · Technical
n. a very light type of task that a computer program runs.
n. a particularly lightweight thread of execution that uses cooperative rather than preemptive multitasking.
“The programmer used a fiber to manage the background tasks efficiently.”
“By implementing fibers instead of standard system threads, the application achieved higher concurrency with significantly lower memory overhead.”
06mathematical mapping
C2 · Proficiency Countable noun Mathematics American English · Technical
n. a set of points that all map to the same result in a math function.
n. the preimage of a single point under a given mapping or function.
“We need to calculate the fiber of the function at this specific point.”
“In algebraic geometry, the fiber of a morphism over a point provides crucial information about the structure of the map.”
Synonyms
Real-World Examples
“Glass preforms are heated until their structure becomes loose enough to be drawn into extremely thin fibers.” “Over two years, we used an old telecom fiber to record and identify 458 clear, high-quality thunderquakes.” Word family
NOUN
ADJECTIVE
Related words
Domains
- Exam level
- CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.B2 FirstIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.5.5–6.5TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 4.0–4.572–94TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.785–944
- Frequency
- Common
- Level
- B2 · Upper Intermediate
- Updated
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QR code
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「日本語」「カタカナ語」 data: JMdict (EDRDG), CC BY-SA 4.0