one-to-one

English

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Pronunciation

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Adjective

one-to-one (comparative more one-to-one, superlative most one-to-one)

1. Matching each member of one set with exactly one member of another set.

   There is a one-to-one relationship between days with large cash shortages and his workdays.

2. (chiefly UK) Involving direct communication between two people.

   a one-to-one discussion

   a one-to-one teaching session

3. (mathematics, of a function) Injective, being an injection: having the property that no two elements of the domain are mapped to the same image.

Synonyms

• (involving direct communication): one-on-one (North America)

Coordinate terms

• one-to-many, many-to-one, many-to-many
• onto

Translations

matching each member of one set with one member of another set

Bulgarian: биективен (biektiven) Catalan: bijectiu m, biunívoc m Chinese: Mandarin: 一對一 / 一对一 (yīduìyī) Finnish: yhdestä yhteen French: biunivoque (fr) m or f Italian: biiettivo Norwegian: Bokmål: en-til-en (no) Polish: odpowiedni (pl) Portuguese: bijetor Romanian: please add this translation if you can Russian: оди́н к одному (ru) (odín k odnomu) Spanish: biunívoco, uno a uno, biyectivo Tagalog: isa-sa-isa

See also

• face-to-face
• man-to-man
• peer-to-peer

Noun

one-to-one (plural one-to-ones)

1. A personal relationship between two people.

   Synonym: 121

2. A direct match or equivalent.
   • 2025 June 2, Adrian Horton, “Tech-bro satire Mountainhead is an insufferable disappointment”, in The Guardian‎, →ISSN:

     And though [Jesse] Armstrong […] continues his avoidance of easy one-to-ones, there’s more than a whiff of Elon Musk to Venis […] .