regular course; this lesson

bookstore, bookseller / publisher / main building / scriptwriter, scenario writer

essence, nature (intrinsic quality)

(regional, Osaka, Kyoto) the script of a kabuki drama / short for 絵入根本 (e iri nehon, “illustrated kabuki script”)

main or trunk line, such as a railroad line or electrical line

picture book

the main object of attention or affection (often used sarcastically) / the idol or other main object of worship at a temple

(sometimes offensive) part of Japan adjacent to Sea of Japan

(dated) part of Japan adjacent to Pacific Ocean and Seto Inland Sea

(slang) the real thing; the genuine article; not a fake