noson

From y nos hon (“this evening, this night”).

• IPA^(key): /ˈnɔsɔn/

noson f (plural nosweithiau, not mutable)

1. (countable) night, evening

• Noson (“night, evening”) is countable and refers to an individual evening or night and so is the word used when employing a qualifying numeral or adjective. It sits in contrast to the word diwrnod (“day”).

noson wych ― a great evening/night

tair noson ― three nights

• Nos (“night, evening”), on the other hand, generally refers to the uncoutable period of darkness. Nos is also used with the names of evenings and nights of days of the week, with holiday and festival names and in the phrase Nos da (“Good night”). It is therefore the opposite of dydd (“day”).

yn ystod y nos ― during the night

nos Wener ― Friday evening/night

Nos Galan ― New Year's Eve

• Noswaith (“evening”) is used in phrase Noswaith dda (“Good evening”). It is also synonymous to noson in some southern dialects.

(South Wales) tair noswaith ― three nights

• nos (“night”)
• noswaith (“evening”)

• R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “noson”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies