[noun](phonology,orthography,grammar) all Japanese morae that can be spelled with 45 single modern kana and 2 historical kana (ゐ/ヰ and ゑ/ヱ) customarily without diacritical marks (゛ and ゜), excluding っ and ん, arranged in a 5x10 table (五十音図(gojūonzu, literally “table of the fifty sounds”)), used for phonological and grammatical analysis
(This term, ごじゅうおん(gojūon), is the hiragana spelling of the above term.)
