noun
Indicates the beginning or initial stage of something. Common in phrases like 序の口 (just the beginning) or 序盤 (opening stage).
これはまだ序の口だ。
This is still just the beginning.
noun
foreword; preface; introduction
Specifically refers to the introductory section of a book or written work. Often used in the compound 序文 (preface).
See also: 序文
この本の序を読んで感動した。
I was moved after reading the preface of this book.
noun
opening of a song (in gagaku or noh)
A technical term in traditional Japanese music and theater, referring to the introductory section of a piece. Part of the 序破急 (jo-ha-kyū) structure.
See also: 序破急
能楽では、序破急の序がゆったりとした導入部にあたる。
In Noh theater, the jo of jo-ha-kyū corresponds to a slow, introductory section.