In 大辞泉 (via goo here) at the first line I found the phrase
［副助］種々の語に付く。
What is the meaning of 副助? Can not find it..
asked Sep 30 '16 at 11:04
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it means 'adverb', more like 'help adverb'. In this context it means you can use か as a help adverb in counting words – TheDefinitionist Sep 30 '16 at 11:23
Dictionaries usually list abbreviations. 副助 stands for 副助詞 "adverbial particle", i.e. [副助] = [adv. part.].
The suffix 詞 is added to all parts of speech and is omitted in the abbreviations. There are also 副詞 "adverb" and 助詞 "particle" which would be abbreviated [副] and [助].
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Here's the list of abbreviations of 大辞泉: dictionary.goo.ne.jp/help/jn/09_04.html – naruto Sep 30 '16 at 17:00
