antidisestablishmentarianism

/ˌæntɪdɪsˌɛstæblɪʃməntˈɛəriəˌnɪzəm/

noun★Advanced

formal

Opposition to the separation of church and state, specifically in 19th-century England.

The term antidisestablishmentarianism refers to the movement that opposed the removal of the Church of England as the official state church.

The pronunciation of antidisestablishmentarianism is often challenging. It is /ˌæntɪdɪsˌɛstæblɪʃməntˈɛəriəˌnɪzəm/.

From anti- + dis- + establish + -ment + -arian + -ism.

This word is often cited as the longest English word.

anti-

against

prefix

dis-

opposite of

prefix

establish

to set up

root

-ment

result or process

suffix

-arian

supporter of

suffix

-ism

doctrine or practice

suffix

✎ Noted on May 2, 2026EN → EN