cubic

cubic — adjective

1. placed before units such as meter, foot, or centimeter to express how much space

1.adjectiveB1
Definition

placed before units such as meter, foot, or centimeter to express how much space a three-dimensional object occupies — found by multiplying its length, its width, and its height.

Example

Gabriel ordered three cubic meters of concrete for the new driveway.

person + order + cubic measure for a purpose

One cubic meter of seawater contains roughly 35 kilograms of salt.

Common collocations
  • cubic meter
  • cubic foot
  • cubic centimeter
  • cubic inch
  • cubic kilometer
Synonyms
  • volumetric

    used in more technical or scientific contexts; 'volumetric analysis' vs. 'cubic meter'

Grammar Patterns

cubic + unit of measurement

number + cubic + unit + noun

Usage Note

This sense is almost always placed before a unit of measurement (meter, foot, centimeter, inch). The object whose volume is being described often follows the unit with 'of,' but can be omitted when the context makes it clear.

Common Mistakes

The room is 5 cubic meters' (meaning each side is 5 m).
The room has a volume of 125 cubic meters' or 'The room is 5 m × 5 m × 5 m.
'cubic meters' expresses total volume, not side length.
a 10 cubic meter room' (hyphen missing).
a 10-cubic-meter room
compound adjectives before nouns need hyphens.

2. shaped like a cube — a solid form whose six faces are all equal squares meeting

2.adjectiveB1
Definition

shaped like a cube — a solid form whose six faces are all equal squares meeting at right angles, such as a dice or a sugar cube.

Example

The children built a small cubic house out of cardboard boxes.

Modern art museums sometimes display large cubic sculptures in their gardens.

used in art/design contexts

Common collocations
  • cubic shape
  • cubic form
  • cubic block
  • cubic structure
  • cubic design
Synonyms
  • cube-shaped

    more conversational and makes the meaning immediately clear; preferred in everyday speech

  • cubical

    the strict synonym, but much less common; mostly used in technical or formal writing

  • three-dimensional

    much broader; describes anything with depth, height, and width, not just a cube

Antonyms
  • flat

    lacking the third dimension entirely

  • two-dimensional

    having only length and width, such as a square drawn on paper

Grammar Patterns

cubic + noun

be + cubic

Usage Note

Unlike the VOLUME MEASUREMENT sense, this sense describes physical form rather than quantity. It can be used predicatively: 'The room is roughly cubic.' In geometry contexts 'cubical' is a close synonym but far less common in everyday English.

Common Mistakes

a cubic meter diamond' (ambiguous — could mean a diamond measuring one cubic meter in volume).
a cube-shaped diamond
use 'cube-shaped' when you mean the form, not the volume.
a cubic room' when the room is not actually a perfect cube.
The room is roughly cubic' or 'nearly cubic.

cubic — noun

Word family

  • cube
    nounA2
  • cube
    verbB2
  • cubical
    adjectiveC1
  • cubicle
    nounB2
  • cuboid
    nounC1
  • cuboid
    adjectiveC1

Synonym discussion

Sense: adjective/2

All four words describe forms that occupy space, but they differ in precision and register. 'Cubic' is the standard adjective for anything shaped like a perfect cube — six equal square faces meeting at right angles. 'Cube-shaped' is its everyday equivalent and is preferred in casual speech when the meaning of 'cubic' could be confused with VOLUME MEASUREMENT (e.g., 'a cube-shaped diamond' is clearer than 'a cubic diamond'). 'Cubical' is a rare synonym found mostly in formal geometry writing and sounds dated in conversation. 'Three-dimensional' is the broadest term — it covers any object with height, width, and depth, including spheres, pyramids, and irregular forms. For example, a 'three-dimensional model' could be a cube, a ball, or a human figure, whereas a 'cubic model' is specifically cube-shaped.

cubic ↗cube-shapedcubicalthree-dimensional

Common collocations

Nouns

Phrases

  • in cubic meters
  • per cubic foot

Prepositions

  • cubic in shape
  • cubic in form

Etymology

GreekLatinFrenchEnglish

The word 'cubic' comes from Latin 'cubicus', which was taken from Greek 'kubikos' (κυβικός), meaning 'cube-shaped'. The Greek root 'kubos' (κύβος) originally meant a six-sided die used in games. The mathematical sense of volume measurement developed later, as geometry and engineering needed a way to describe three-dimensional space. English borrowed the word in the mid-1500s, first for the shape meaning and later for the measurement sense.