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A term of address for a young male or in reference to such a person from the Esperanto or Esperantido speaking communities, especially by someone who isn't from it. It is derived from "knabo", the Esperanto word for a boy plus the "-ulo" suffix taken from Ido, the only language of the two to be truly gender neutral. Plural "knabuloj" or "knabuloi", based on the Esperanto and Ido plurals respectively.
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