練熟 (れんじゅく) Japanese meaning | KotomoraMeanings
1
noun, noun or participle which takes 'suru', intransitive verb
proficiency; skill; experience
Refers to a high level of skill or expertise gained through practice and experience. Often used in formal or written contexts.
この仕事には高度な技術の練熟が必要だ。
This job requires a high level of technical proficiency.