1. A religious service towards midnight on the last night of the year.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• qatch night,
• aatch night,
• satch night,
• eatch night,
• 3atch night,
• 2atch night,
• wztch night,
• wstch night,
• wwtch night,
• wqtch night,
• warch night,
• wafch night,
• wagch night,
• waych night,
• wa6ch night,
• wa5ch night,
• watxh night,
• watvh night,
• watfh night,
• watdh night

The adjective form of "watch night" is "watchful".

The plural form of "watch night" is "watch nights".

The singular form of "watch night" is "watchnight" or "watch-night".