first principle: meaning, definition, pronunciation and examples
C1Formal, Academic, Technical
Quick answer
What does “first principle” mean?
A foundational proposition or assumption that cannot be deduced from any other proposition or assumption.
Audio
Pronunciation
Definition
Meaning and Definition
A foundational proposition or assumption that cannot be deduced from any other proposition or assumption; a fundamental truth from which other truths are derived.
In practical usage, it refers to reasoning or problem-solving that breaks down complex ideas into their most basic, self-evident components to build knowledge or solutions from the ground up.
Dialectal Variation
British vs American Usage
Differences
No significant differences in definition. The concept is equally used in both varieties, though spelling and minor phrasing in example sentences may differ ('analyse' vs. 'analyze').
Connotations
Strongly associated with logical rigour and foundational knowledge. In business/innovation contexts (e.g., Elon Musk's promotion of 'first principles thinking'), it connotes disruptive, non-incremental innovation.
Frequency
Moderate frequency in academic/professional discourse; low frequency in everyday conversation.
Grammar
How to Use “first principle” in a Sentence
reason from first principlesstart from first principlesderive X from first principlesa first-principles analysis of YVocabulary
Collocations
Examples
Examples of “first principle” in a Sentence
verb
British English
- Engineers are taught to analyse problems by reasoning from first principles.
- He first-principled his way to a novel solution.
American English
- We need to deconstruct this issue from first principles.
- She first-principled the entire design process.
adverb
British English
- He argued first-principles, ignoring all precedent.
American English
- They built the model first-principles, without using existing frameworks.
Usage
Meaning in Context
Business
Used to describe innovative problem-solving that ignores existing solutions or analogies. 'We need first-principles thinking to redesign this supply chain.'
Academic
Used in philosophy, physics, mathematics to denote indemonstrable foundational propositions. 'Aristotle's metaphysics is built on certain first principles.'
Everyday
Rare. Might be used to suggest simplifying a complex personal decision. 'Forget what others do; go back to first principles: what do you actually need?'
Technical
Common in engineering and computer science for designing systems from fundamental laws (e.g., physics, logic). 'The chip was designed from first principles.'
Watch out
Common Mistakes When Using “first principle”
- Using it to mean simply 'the most important rule' rather than a foundational, non-derived truth.
- Writing it as 'first-principle' (singular) when typically used in the plural 'first principles'.
- Confusing with 'prime principle' or 'cardinal principle'.
FAQ
Frequently Asked Questions
The term is almost always used in the plural: 'first principles'. The singular 'first principle' is rare and usually refers to one specific foundational rule in a set.
They are often synonymous, but 'first principle' more strongly implies that it is primary, self-evident, and non-derivative from other principles. A 'fundamental principle' is very important but might be derived from other ideas.
Entrepreneur Elon Musk frequently cites first-principles reasoning as his core problem-solving strategy, contrasting it with reasoning by analogy. The concept itself originates with Aristotle.
In classical philosophy and logic, first principles are considered self-evident or axiomatic; they are the starting points for proof but are not themselves proven within the system they found. They are assumed to be true.
A foundational proposition or assumption that cannot be deduced from any other proposition or assumption.
First principle is usually formal, academic, technical in register.
First principle: in British English it is pronounced /ˌfɜːst ˈprɪnsəpəl/, and in American English it is pronounced /ˌfɜːrst ˈprɪnsəpəl/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “First-principles thinking”
- “To go back to first principles”
Learning
Memory Aids
Mnemonic
Think of building a house. You don't start with the wallpaper; you start with the FIRST PRINCIPLES: a foundation (principle 1) and load-bearing walls (principle 2).
Conceptual Metaphor
KNOWLEDGE/REASONING IS A BUILDING (with first principles as the foundation). THINKING IS SEEING (first principles provide clarity).
Practice
Quiz
Which of the following best exemplifies 'first-principles thinking'?