Definition
A double check is the act of verifying something a second time in order to confirm its accuracy, completeness, or correctness. It can be performed manually or with the aid of tools, and is commonly applied in contexts such as proofreading, data entry, safety procedures, and technical troubleshooting.
Usage in English
- As a verb phrase: “Please double‑check the figures before submitting the report.”
- As a noun: “The double check revealed a typo in the email address.”
Etymology
The expression combines double, meaning “twice” or “twofold,” with check, derived from the Old French eschequier (to examine or verify) and ultimately from the Latin ex + cautare (“to take care”). The phrase first appeared in English in the early 20th century, reflecting the increasing complexity of tasks that required repeated verification.
Related Concepts
- Verification – the broader process of establishing truth or validity.
- Cross‑checking – comparing two independent sources or methods to confirm consistency.
- Redundancy – inclusion of extra components or steps to reduce the chance of error, of which double‑checking can be considered a procedural form.
Examples in Specific Domains
| Domain | Typical Application |
|---|---|
| Aviation | Pilots perform a “double‑check” of instrument settings before take‑off. |
| Healthcare | Nurses double‑check medication dosages to prevent administration errors. |
| Software Development | Developers may double‑check code logic by reviewing it and running automated tests. |
| Finance | Accountants double‑check ledger entries to ensure accurate financial statements. |
Notes
- While “double check” is widely understood, it is not a formal technical term in most scientific disciplines; rather, it describes a routine practice.
- In computer science, the related pattern “double‑checked locking” refers to a specific concurrency control mechanism, but it is distinct from the general verb phrase “double check.”
References
- Oxford English Dictionary, entry for “double‑check.”
- Merriam‑Webster Dictionary, definition of “double‑check.”
- Relevant style guides (e.g., The Chicago Manual of Style, 17th ed.) that recommend double‑checking for accuracy.
