define per: Quick Hook
define per is a small phrase with big utility, and people ask about it more than you might think. It shows up in contracts, recipes, academic writing, and casual speech, so knowing its shades of meaning helps you read and write with confidence.
Short, useful, and a little slippery. You probably use it every week without thinking. Here is a clear, friendly guide to what define per actually means and how to use it well.
Table of Contents
What Does Define Per Mean?
The phrase define per asks you to state or explain something according to a particular standard, source, rule, or rate. In plain terms, it means ‘as specified by’ or ‘in accordance with’.
Use it when you want clarity about which measure, guideline, or authority governs a definition, amount, or action. For example, a teacher might tell students to define a term per the textbook, meaning the textbook’s definition should guide their answer.
Etymology and Origin of Define Per
The word per comes from Latin per, meaning through or by means of. English adopted it centuries ago as a preposition that indicates distribution, rate, or accordance.
The verb define is from Latin definire, to set bounds or describe. Put together, define per lives at the intersection of prescription and definition, asking for meaning that follows a particular rule or source.
For historical background on the preposition per, see entries at authoritative dictionaries such as Merriam-Webster and Dictionary.com.
How Define Per Is Used in Everyday Language
Here are real, everyday examples that show how people use define per in writing and speech. Read them aloud. They sound natural in the right contexts.
Define per the employee handbook, what counts as a full day of leave?
Please define per the project brief how we should measure success.
Can you define per recipe what a ‘serving’ means here?
We define per statute the deadline for appeals as 30 days from notice.
When you write your glossary, define per APA style the technical terms you use.
Those lines show the phrase functioning as an instruction to follow a specified source: handbook, brief, recipe, statute, or style guide.
Define Per in Different Contexts
Legal and formal writing often uses define per to anchor a meaning to a statute or contract clause. Lawyers and judges like precision, and this phrase helps point to the authoritative text.
In academic and editorial contexts, define per tells a reader which methodology or style governs a definition. A researcher might write, define per ISO standards, when a measurement needs a consistent protocol.
In everyday speech, the phrase is looser. Someone might say, define per the menu what counts as a large portion, and everyone will understand the idea without needing formal citation.
Common Misconceptions About Define Per
People sometimes treat define per as interchangeable with ‘define as’ but they are not identical. Define as introduces a direct definition, while define per signals reliance on an external source or standard.
Another mistake is overusing define per in casual text where simpler phrasing would do. Saying ‘according to’ or ‘as defined by’ can be clearer for some audiences. Clarity first. Always consider who will read your sentence.
Related Words and Phrases
Words in the same family include according to, as per, in accordance with, per se, and pursuant to. Each has a slightly different flavor. According to feels neutral, as per is a bit formal, and pursuant to is very legalistic.
For grammar help and comparable terms, check related pages on AZDictionary such as Grammar Terms and Preposition Meaning. Those pages explain how prepositions like per operate in sentences.
Why Define Per Matters in 2026
We live in a world full of standards, from international regulations to app terms of service. Knowing how to define per helps you point to the right authority when precision matters, and 2026 is no exception.
Think about data privacy, remote work policies, and global collaborations. When a team member asks you to define per the privacy policy what counts as consent, you must know which document and clause govern the meaning.
Language evolves, but the need for clear reference does not. Using define per correctly reduces dispute, speeds decision making, and keeps communication tight.
Closing
define per is small but powerful. Use it when you need a definition tied to a specific source, standard, or rate. It helps you avoid ambiguity and points readers to the rule that matters.
Want a compact rule of thumb? If you need to anchor meaning to a document, person, or method, say define per. Short and useful. See more examples and related entries at trusted sources such as Oxford Learner’s Dictionaries and review usage notes at Merriam-Webster.