序 - preface, beginning, order

rank; ranking order; hierarchy

disorder; chaos; confusion

seniority by length of service

introduction

order; discipline; regularity; system; method

preface; foreword; introduction

opportunity; occasion; chance

order; sequence

opening (in a game of go, chess, etc.)

overture; prelude

curtain-raiser; prologue

public order and morals; social standards; public policy