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to free

to free

2 7.5
To release gas or energy during a chemical reaction
  • verb
  • /friː/
  • Specialized
translation icon : liberar
  • Desorption frees up space for incoming molecules, and the process continues.

Examples

  • Fossil fuels freed humanity to apply an incredible amount of unused brain power to scientific advancement without hard labor having to be done.

    Blog text (6)
  • The excessive rate of bone breakdown frees calcium that, in turn, can be elevated in serum and excreted in urine.

    Academic text (2004)
  • When light strikes the cell, its energy frees electrons within the silicon.

    Academic text (2009)
  • This frees up large amounts of arachidonic acid.

    Academic text (1999)
  • When light strikes the cell, its energy frees electrons within the silicon.

  • An oven will cook the samples, freeing gases and water trapped inside.

  • The excessive rate of bone breakdown frees calcium that can be elevated in serum.

Synonyms

to release
vsto free
446 2.7

To allow a liquid, gas, or energy to flow out

focuses on escape specifically as a result of reaction or decomposition
to liberate
vsto free
  • Specialized
8 5.8

Release a gas or energy during a chemical reaction

includes physical processes and decomposition as additional causes of emission
to outgas
vsto free
  • Specialized
7.9

To release gas from a material when it is heated or in a vacuum

describes emission caused by chemical or physical reactions and decomposition

Antonyms

919 2.6

To catch and hold someone or something so they cannot leave

388 3.5

To keep something dangerous from spreading or getting worse

Idioms

450 1.0

Without paying any money

You do not have to pay for it

scot-free
  • Informal
19 8.4

Not punished for doing something wrong

free to chat
  • Texting
2.0

Available now and willing to have a short talk

To stay constantly in someone's thoughts and annoy them

Phrasal Verbs

218 2.7

To let a person or animal go after keeping them in a place where they could not leave

159 2.4

You can do something without asking for permission or worrying

71 3.4

Have permission to leave a place where you were kept, usually after being arrested or accused

18 4.5

To leave a court or prison without being punished

To escape limits or control and become independent

To make more room by removing or moving things

to free-associate
  • Specialized
2 8.0

To think of ideas and memories without planning

1 8.6

A thought that stays in your mind and bothers you

To get a free meal by asking or finding a chance to eat

Compounds

free speech
  • Formal
178 3.2

The right to say what you think in public without the government stopping you

117 1.0

A time when you are not working and can do things you enjoy

93 5.8

Ability to choose what you do without being controlled by outside forces

free agent
  • Jargon
80 3.9

A professional athlete not under contract who can sign with any team

57 3.5

Buying and selling between countries without government taxes or limits

50 2.8

A shot taken from the free-throw line without being blocked after a foul

Free World
  • Archaic
39 6.7

Countries with non-communist governments that opposed the Soviet Union during the Cold War

free ride
  • Informal
37 4.2

A benefit you get without paying or working

free agency
  • Jargon
30 3.7

A time when a player can sign with any team because they have no contract

A system where private businesses compete and the market sets prices with little government control

26 1.0

Food you are given without paying

23 4.8

A person who follows their own way and ignores social rules

22 1.0

A food or drink that contains no fat

free press
  • Literature
22 3.0

News media that report independently and are not controlled by the government

free pass
  • Informal
18 4.2

An excuse that lets someone avoid rules or blame because of their position

free lunch
  • Informal
17 4.2

Something offered without obvious cost but that often has hidden costs

15 4.1

Freedom to act and make choices without someone controlling you

An agreement from 1994 that made trade easier between the United States, Canada, and Mexico

11 3.4

A ticket that lets someone enter a place without paying

11 5.6

A chance to avoid punishment or trouble

free-for-all
  • Informal
10 6.2

A wild fight or argument with many people and no rules

free software
  • Specialized
9 3.2

A computer program with its code available that you can use, change, and share without paying

free radical
  • Specialized
8 5.1

A small unstable atom or molecule that can damage body cells by reacting with them

free love
  • NSFW
7 6.5

Sex between people who are not married, often part of a belief in sexual freedom

7 2.3

Not paying money to live in a house or room

free kick
  • Specialized
7 2.3

A kick given to a team after the other team breaks a rule, taken without nearby opponents

free fall
  • Specialized
6 4.0

Movement of something downwards while only gravity pulls it

6 4.6

A sudden large drop in value, often of stocks or prices

5 3.4

A heavy object like a dumbbell or barbell that you lift for exercise

5 4.1

The freedom to act or decide without being told what to do

free zone
  • Specialized
5 4.1

An area near a port where companies store goods for export without paying customs duties

4 6.3

A person who acts alone and does not follow group plans

4 3.9

A person who supports trade between countries without import taxes or other barriers

A way of eating that avoids foods with gluten for people with celiac disease or gluten intolerance

free verse
  • Literature
3 6.0

Poems that do not have regular rhyme or a steady beat

free-and-easy
  • Informal
2 5.7

Relaxed and friendly without following strict rules

2 5.3

A work that does not follow fixed rules or structure

Supporting a system where private businesses compete with little government control

A chicken raised outdoors with space to move around and find food

1 4.1

A way of running an economy that lets businesses compete with little government control

free port
  • Specialized
1 4.1

A part of a port where businesses bring, store, and send goods without paying taxes

1 3.5

Does not contain the metal lead

1 5.1

Armed forces and political movement led by Charles de Gaulle who resisted German occupation in World War II

1 6.1

A province in central South Africa known for farming and wide open plains

1 7.2

A belief in religious ideas based on reason and facts rather than on tradition or leaders

1 5.3

Giving children freedom to explore and make choices with little adult help

free form
  • Specialized
1 6.5

A small part of language that can be a whole word

free association
  • Specialized
1 6.8

A way of saying the first thought that comes to your mind to find hidden feelings

free electron
  • Specialized
1 4.9

An electron not attached to an atom that can move freely and carry electricity

free energy
  • Specialized
1 6.3

Amount of energy in a system that can do work

free-for-all
  • Jargon
1 4.1

A game mode where each player plays alone against all others

rent-free
  • Slang
1 8.2

To stay in someone's mind when they do not want it

free grace
  • Formal
1 9.9

God gives kindness without being earned to save people

free house
  • Jargon
1 4.9

A pub not owned by a brewery that can sell beers from any supplier

free energy
  • Specialized
1 8.6

A number used in brain and computer models to measure surprise and guide learning

free state
  • Archaic
1 6.9

A state where laws did not allow people to own slaves before the American Civil War

free-reed
  • Specialized
1 9.1

A thin metal tongue that vibrates in a slot to make sound in harmonicas or accordions

A small bat that flies fast, eats insects, and has a tail sticking out past the skin between its wings

A way of eating that avoids salt to help lower blood pressure

7.9

A number calculated from data that does not need the data's distribution to be known

free list
  • Specialized
4.4

A list of goods that do not have to pay import tax

A way of behaving in which a person enjoys many pleasures and expensive things

free burning
  • Specialized
8.3

A fire that keeps going in open air, often like an electric arc

9.0

A way a flower ovary holds the parts that make seeds on a central column without inner walls

free morpheme
  • Specialized
6.0

A part of language that can stand alone as a word

free nerve ending
  • Specialized
7.0

A tiny part of the skin that sends signals about pain and temperature

Marked rectangle near the basket where players stand during free throws

free pardon
  • Formal
5.9

An official act that forgives someone for a crime and ends their legal punishments

free phagocyte
  • Specialized
6.4

A white blood cell that moves in the blood and eats germs or dead cells

free rhythm
  • Specialized
7.7

Music played without a regular beat so the timing flows freely

A former 19th century US party that opposed slavery spreading into western lands

Able to fly freely after being released into the wild

free-liver
  • Archaic
9.8

A person who often eats and drinks a lot for pleasure without limits

How Much

to expel
34 5.0
to free
  • Specialized
2 7.5
to release
446 2.7
to emit
91 4.4
to give off
57 2.6

Surface Forms

free infinitive
freeing present participle
frees third person singular
freed past
freed past participle

Etymology

Free in science for gas or energy uses the image of letting something 'go' or be 'set loose', the same picture behind the old word frijaz. So when a reaction frees energy or gas it lets that energy or those particles move out.