[noun][from early 900s] the second day after some set point in time
[noun][from late 900s] the second day of the month
[noun][from 1786](historical) during the Edo period, the two-day period of the day of 大祭(taisai, “major festivals”) and the preceding day's 宵祭り(yoi matsuri, “eve-festivals”)
[noun][from 1811]short for 二日灸(futsuka-kyū), moxibustion traditionally performed on the second of February or August in the belief that this conferred year-long good health