conditioner

Etymology

It is formed from English condition + -er, the agent suffix added to the verb.^[2][3][4][5] The verb comes from the noun condition,^[4] which is from Middle English condicioun, from Old French condicion (“stipulation; state”), from Latin condiciō (“agreement, stipulation; situation”), from condīcō (“to talk together, agree upon”), from com- (“together”) and dīcō (“to speak”).^[4]

Earliest recorded meaning

One who makes conditions, a bargainer: 1598, in Florio's Italian–English dictionary A Worlde of Wordes; the sense is recorded only then.^[2][3][4]

Semantic evolution

The modern word grew out of the verb condition in the sense "to bring into a desired state", recorded from 1844.^[4] Conditioner meant an agent that brings something into good condition from 1888,^[2][6][4] then a machine for conditioning grain (1909) and a worker who tests the condition of yarn (1921).^[2] From 1938 it was often short for air conditioner,^[2][4] and since about 1960 it has usually referred to a preparation for the hair.^[4]

Timeline

• 1598 – one who makes conditions, a bargainer (obsolete).^[2]
• 1888 – an agent that brings something into good condition.^[2][6]
• 1909 – a machine for conditioning grain.^[2]
• 1921 – a worker who tests the condition of yarn.^[2]
• 1938 – short for air conditioner.^[2][4]
• c. 1960 – usually a hair-care product.^[4]

Meanings

Noun

1. A preparation applied to the hair, or to fabrics in washing, to improve their condition: She rinsed out the conditioner and dried her hair.^[7][6][3]
2. A substance added to a material or product to improve its physical state, as soil conditioner.^[6][2]
3. An air conditioner.^[2][6][3]
4. A person or thing that conditions, such as a trainer of athletes or show animals.^[6][7]
5. A worker who tests or conditions a product such as yarn, or a machine that brings grain into condition.^[6][2]
6. (obsolete, 1598) One who makes conditions; a bargainer.^[2][3]

Word family

• air conditioner

Related words

• condition
• diction

References

1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h i j k l m n Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c d e Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
4. ^ a b c d e f g h i j Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
5. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
6. ^ a b c d e f g Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
7. ^ a b Collins English Dictionary (2023), Glasgow: HarperCollins