What does particle mean?
A particle is a tiny constituent of a larger system. In physics, the word refers especially to the fundamental particles from which matter is understood to be built, including electrons, protons, neutrons, and neutrinos. These are studied through experiments involving particle accelerators and detectors, and discoveries in this field have transformed scientific understanding of matter, energy, and the universe. In linguistics, a particle is a grammatical element that cannot stand alone as a full word; English examples include prepositions such as “in” and conjunctions such as “because,” although the precise boundaries of the category vary among grammatical theories. More generally, the word can mean a small speck or fragment, as in a particle of dust. Its main associations are therefore scientific precision, mathematical description, and the idea of something small but potentially significant.
nounA particle is a very small or microscopic constituent of matter, especially an elementary particle such as an electron, proton, or neutrino. In linguistics, it means a small function word that cannot stand alone as an independent word.
- An extremely small constituent of matter, especially one studied in particle physics, such as an electron, proton, or neutrino.
- In linguistics, a small function word that cannot function independently as a word, such as a preposition, conjunction, or certain pronouns.
- A small or minute portion or speck of something.
- In historical and philosophical usage, a fundamental or irreducible element or principle of nature.
"The detector recorded the collision of two subatomic particles."
"Scientists at the accelerator observed the decay of an unstable particle."
"Prepositions and conjunctions are classified as particles because they express grammatical relationships rather than lexical meaning."
The regular plural is “particles,” used for both physical particles and linguistic particles.
"The chamber contained millions of particles."
Everything you can see is built from particles, including the atoms in your eyes; modern physics has traced familiar matter to an astonishing variety of tiny building blocks.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does particle come from?
The word comes through Latin from particula, a diminutive of pars, meaning “part” or “portion.” The Latin word was borrowed into English as particle and originally referred to a small or minute part. Its scientific sense developed in the modern era as physics began to describe matter in terms of increasingly small constituents.
Related word forms
How particle is actually used
In physics, the term usually refers to a fundamental or subatomic entity, though it can more broadly mean a constituent of a material system. In linguistics, it is a technical term for a non-independent grammatical element. The broader sense of a tiny portion or speck is common in general writing but can sound formal or literary.
Easily confused with particle
A particular is a specific instance or person, whereas a particle is a small constituent of matter or a linguistic function word.