deficiency
dih-FISH-uhn-see
/dɪˈfɪʃənsi/
A lack or shortage of something necessary for health or function.
Usually refers to a specific missing element (like a vitamin) rather than a general lack of food.
The story behind the word. From the Latin 'deficere', meaning 'to fail' or 'to leave'. It literally describes a situation where the 'making' of something has fallen away or failed to reach completion.
Word relationships
- deficit: More common in financial contexts.
- scarcity: Refers to a general lack of resources in a region.
- surplus: An amount left over when requirements have been met.
- abundance: A very large quantity of something.
Commonly confused with
- insufficiency: Insufficiency means there isn't enough; deficiency often implies a complete absence or a level below a critical threshold.
Word family
- deficient (adjective): Lacking in some necessary quality or element.
- deficit (noun): The amount by which something is too small.
Collocations
- vitamin deficiency
- immune deficiency
- correct a deficiency
Example sentences
- "The most common nutritional deficiency in the world is iron deficiency." A World Health Organization report on global health issues. (WHO Global Health Report)
- "The gardener realized the soil had a nitrogen deficiency, preventing the roses from blooming." Explaining why a plant is turning yellow.
Memory hook
If you have a deficiency, you are 'de-efficient'—your body isn't working efficiently because something is missing. Deficiency means something is 'de-ficient' (not efficient).
When not to use
Don't use it to describe a simple desire for something; it implies a functional failure due to the absence.
Fun facts
- The term 'vitamin' was coined specifically to describe substances whose deficiency caused diseases like scurvy.
Related words
Also appears in
Take your vocabulary further with LangBlitz
Our English vocabulary app: FSRS spaced repetition, 5,000+ curated words across 119 topic groups, CEFR A1 to C2. Explore your mastery with the beautiful Vocabulary World feature.