Noun
one long cylindrical thing; one film, TV show, etc.; one goal, home run, etc.; one telephone call
「もう一本くれ」と彼が言った。"Give me a fresh bottle," he said. one version
one book; a certain book
ippon; one point; a blow
Martial arts
geisha
Noun, used as a suffix
single-minded focus on ...
after a noun; usu. as ...～で, ...～に, etc.
Also written １本【いっぽん】