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Substance

SUB-stuhns /ˈsʌbstəns/

nounB2SATGRETOEFLIELTS

formalscientificgeneral

A particular kind of matter with uniform properties; also, the most important or essential part of something.

In chemistry, it refers to a pure material (element or compound). In general use, it can mean the core meaning or reality of something.

The story behind the word. The word 'substance' comes from the Latin 'substantia,' meaning 'being,' 'essence,' or 'material.' It's derived from 'substare,' which means 'to stand under' or 'to be present.' This origin reflects the idea of something that underlies or forms the essential nature of a thing. In philosophy and later in science, it came to mean the fundamental reality or material of which something is made.

Word relationships

material: Similar, but 'material' can also refer to raw matter that isn't necessarily pure.
matter: More general term for anything that has mass and takes up space.
essence: Refers to the fundamental nature or core meaning, similar to the non-chemical sense of substance.

nothingness: Absence of matter or meaning.
superficiality: Lack of depth or importance, opposite of the 'essence' sense.

Commonly confused with

Material: While often interchangeable, 'substance' in chemistry implies a pure element or compound, whereas 'material' can be a mixture or a raw, unprocessed form of matter.

Word family

substantial (adjective): Of considerable importance, size, or worth; existing independently.
substantiate (verb): To provide evidence to support or prove the truth of something.

Collocations

chemical substance
hazardous substance
illegal substance
controlled substance
the substance of the argument

Idioms & expressions

in substance
of substance

Example sentences

"Water is a pure substance, whereas air is a mixture of several gaseous substances." Referring to a chemical material.
"The lawyer argued that the substance of the contract remained valid despite minor clerical errors." Referring to the essential meaning.
"The mysterious substance found at the crime scene was sent to the lab for analysis." In a general material sense.

Memory hook

Think of 'SUB-stance' as the 'SUB-strate' or 'SUB-stratum' – the underlying material or core of something. SUB-stance: SUB-strate, core matter

When not to use

While 'substance' can refer to matter generally, in a scientific context, it implies a pure material with consistent properties.

Fun facts

The concept of 'substance' has been central to philosophy for millennia, from Aristotle's metaphysics to modern scientific definitions.
In legal contexts, 'substance' can refer to the true meaning or intent, rather than just the literal words.