Evo Inflector implements English pluralization algorithm based on Damian Conway's paper "An Algorithmic Approach to English Pluralization".

The tests performed (May 2014) based on data from Wiktionary show that:

• for entire set of 163518 words from Wiktionary, Evo Inflector returns correct answer for 68.4% of them,
• for 979 words marked as basic words almost all answers are correct, the sole exception being the word 'worse' which when used as a noun does not have a plural form,
• for 24.9% of all words Evo Inflector returns some form, but the word is marked as uncountable in Wiktionary,
• for 4.1% of all words Wiktionary does not specify the plural form for given word so whatever Evo Inflector returns will always be wrong,
• for 2.6% Evo Inflector returns an answer which is different than the one provided in Wiktionary.

(If you are curious this test is part of the unit tests.)

1.2

• compile with Java 1.6 for better compatibility
• -s -> -ses, for instance pancreas -> pancrases
• -ulum -> -ula, for instance baculum -> bacula
• some minor optimizations
• better testing with Wiktionary dump

1.1

• fix for -us ending words, like virus

1.0.1

• add inflection with count

1.0 Initial revision

System.out.println(English.plural("word")); // == "words"

System.out.println(English.plural("word", 1)); // == "word"
System.out.println(English.plural("word", 2)); // == "words"

Evo Inflector is available under Apache License 2.0.

You can download the library from here or use the following Maven dependency:

<dependency>
    <groupId>org.atteo</groupId>
    <artifactId>evo-inflector</artifactId>
    <version>1.2</version>
</dependency>