whereby

IPA/weəˈbaɪ/
KK[wɛrbˈaɪ]IPA/werˈbaɪ/

whereby — adverb

1. used to indicate the method, system, or process by which something is made possi

1.adverbB2
Definition

used to indicate the method, system, or process by which something is made possible or achieved.

Example

Bao invented a filing system whereby documents are sorted by colour rather than date.

noun + whereby + clause (system/process pattern)

The college runs a programme whereby first-year students are paired with a senior mentor.

noun + whereby + clause (programme/arrangement pattern)

Common collocations
  • system whereby
  • method whereby
  • process whereby
  • programme whereby
  • scheme whereby
Synonyms
  • by which

    less formal and more common in everyday writing; 'whereby' is one compact word

  • through which

    suggests the means or channel rather than the method itself

  • by means of which

    even more formal and slightly longer

Grammar Patterns

noun + whereby + clause

Usage Note

Frequently follows nouns such as 'system', 'method', 'process', 'scheme', or 'programme'. Cannot replace 'by which' in questions — it is a relative adverb only.

Common Mistakes

Whereby can I pay the bill?
How can I pay the bill?
'whereby' is not used in questions; use 'how' or 'by what method' instead.
The tool whereby he fixed the car.
The tool with which he fixed the car.
'whereby' refers to a method or system, not a physical tool.

2. used to describe the particular situation, arrangement, or set of circumstances

2.adverbB2
Definition

used to describe the particular situation, arrangement, or set of circumstances in which something happens or exists.

Example

The neighbours reached an arrangement whereby they share the cost of the garden fence.

arrangement whereby + clause

The two companies signed a deal whereby Mira's firm handles all overseas distribution.

deal whereby + clause

Common collocations
  • arrangement whereby
  • agreement whereby
  • deal whereby
  • situation whereby
  • position whereby
Synonyms
  • in which

    the neutral, everyday alternative to 'whereby' in this sense

  • under which

    common for agreements, rules, or conditions

  • where

    informal alternative; 'a situation where' is very common in speech

Grammar Patterns

noun + whereby + clause

Usage Note

Commonly follows nouns like 'situation', 'arrangement', 'agreement', 'deal', 'position', or 'relationship'. The focus is on the context or circumstances rather than the method.

Common Mistakes

A situation whereby nobody knows the truth.
A situation in which nobody knows the truth.
'whereby' is grammatically possible but 'in which' is more natural for describing circumstances.

whereby — conjunction

Word family

Synonym discussion

Sense: adverb/1

'Whereby' and its alternatives all express the idea of a method or means, but they differ in formality and syntax. 'By which' is the neutral, everyday choice: 'the method by which data was collected.' 'Through which' emphasises the channel or medium rather than the method itself: 'the channel through which information flows.' 'By means of which' is the most formal and often sounds heavy: 'a procedure by means of which errors are detected.' 'Whereby' packages 'by which' into a single word and carries a distinctly formal, written-register tone. In speech, most people would say 'a system where you can book online' using 'where' informally, whereas 'a system whereby you can book online' sounds legal or academic. For learner production, 'by which' is the safest alternative in both formal and semi-formal writing.

by whichthrough whichby means of whichwhereby ↗

Common collocations

Nouns

Etymology

Old EnglishMiddle EnglishEnglish

Formed in Middle English from 'where' (from Old English hwǣr, meaning 'at what place') and the preposition 'by'. It belongs to a family of relative adverbs — whereby, wherein, whereupon, whereof — that were created by combining 'where-' with prepositions, following a pattern seen in Old English and later reinforced by French and Latin models. Originally used in both questions and relative clauses, but the interrogative use (as in 'Whereby shall we know this?') has largely disappeared from modern English, surviving only in archaic or Biblical style.