年中(ねんじゅう)whole year, all year long

Common

1. Noun

   1. 1.

      whole year, all year round, throughout the year

2. Adverb

   1. 2.

      always, all the time, perpetually

      Only applies to ねんじゅう, ねんぢゅう

3. Noun

   1. 3.

      during an era

   2. 4.

      middle class (of a nursery school, etc.)

      Only applies to ねんちゅう