WEBnoun noun (generic) Dictionary. Definition of 加号. Reading. 加 か 号 ごう. か ご う. kagou. Meaning. noun. plus sign, sign of addition. How to write. Show stroke number. Kanji in this word. 加. 5 strokes. add,addition,increase,join,include,Canada. 号. 5 strokes. nickname,number,item,title,pseudonym,name,call. Advertisement. Extended information.