What does 一徹 mean in Japanese?

What does 一徹 mean in Japanese? 一徹 一徹 ; 一徹x田中義一先丸蛸引330mm 白紙鋼付鞘 · 一徹x田中義一先丸蛸引330mm 白紙鋼付鞘 NT$18,800 ; 一徹x田中義一先丸蛸引300mm 白紙鋼付鞘 · 一徹x田中義一先丸蛸引 一徹 av Definition of 一徹 Click for more info and examples: いってつ - ittetsu

一徹 av Definition of 一徹 Click for more info and examples: いってつ - ittetsu

一徹 av Definition of 忠義一徹 ちゅうぎいってつ 忠義一徹 Kanji staunch in one's devotion to Need to translate 一徹 from Japanese? Here are 2 possible meanings