blynedd

Etymology
From, originally a plural, from , earlier , with syncope of -a- and pretonic shortening of -ē- to -ɨ-, from , nominative plural of (whence ).

Noun

 * 1) year

Usage notes
In Welsh, refers to age and is the word used for a single year and is also found after numbers. The plural is little utilised. When referring to any other kind of year, the word is in the singular,  in the plural and the special form  is used after numbers.