Plural of Dictionary

The Quick Answer

The plural of dictionary is dictionaries.

The Plural of Dictionary

The plural of dictionary is dictionaries.

Spellings are made by people. Dictionaries - eventually - reflect popular choices.
People are under the impression that dictionaries legislate language. What a dictionary does is keep track of usages over time.

The noun dictionary adheres to the standard rules for forming the plurals of nouns in English (shown in the table below).

Type	Example of Type	Forming the Plural	Plural
Most Nouns	lamp scythe	add s	lamps scythes
Noun Ending s, sh, ch, x or z	bus dress	add es	buses dresses
Nouns ending [consonant] o	hero zero tomato	add either s or es (There are no rules for this - you have to know.)	heroes zeros tomatoes
Nouns ending [vowel] o	patio ratio	add s	patios ratios
Nouns ending [consonant] y	dictionary penny	change the y to an i and add es	dictionaries pennies
Nouns ending [vowel] y	journey donkey	add s	journeys donkeys
Nouns ending f or fe	dwarf hoof	ves and/or s (There are no rules - you have to know.)	dwarfs hooves or hoofs
Exceptions	man louse	some nouns undergo a vowel or letters change	men lice
More exceptions	salmon sheep	some nouns do not change at all	salmon sheep

Why Is There Confusion over the Plural of Dictionary?

Dictionaries is the only way to make the noun dictionary plural.

Confusion arises because people mistakenly believe that only an s needs to be added (like with donkeys). However, when a noun ends with [consonant] + y, you need to change the y to an i and add es to form the plural.

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