What grade level is the word koi?

The word koi is typically considered a 6 level word in the US education system.

How common is the word koi?

In terms of usage frequency, koi is classified as a Top 10k word.

What is the CEFR level for koi?

koi has a Common European Framework of Reference (CEFR) level of B2.

Is koi a Tier 1, Tier 2, or Tier 3 vocabulary word?

It is classified as a tier 2 word, meaning it is a high-frequency, academic word often found across a variety of texts and subjects.

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Definition of koi

koi

/kɔɪ/

koi

Plural:koi

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koi Lexical Profile

CEFR

Grade

Tier

Usage

Top 10k

• noun

A brightly colored ornamental variety of the Amur carp (Cyprinus rubrofuscus), originally bred in Japan and commonly kept in outdoor decorative ponds or water gardens.

Example

"The botanical garden featured a tranquil meditation space overlooking a shallow pool filled with vibrant orange and white koi."

Synonyms

View all synonyms for koi

• Rhymes for koi

• Nearby Words

koi

Word Origin & Etymology

Borrowed into English in the mid-20th century from Japanese 'koi' (鯉), meaning 'carp'. The ornamental breeding of the fish, known specifically in Japanese as 'nishikigoi' (brocaded carp), began in Niigata, Japan, in the early 19th century.

Usage Trend

Historical frequency of usage in published text.

180019102020

Data source: Google Books Ngram Viewer

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Wordmom. (2026). Definition of Koi. In Wordmom Dictionary. Retrieved Oct 13, 2026, from https://wordmom.com/dictionary/koi