noun
proof-of-concept; demonstration experiment; verification test
Used in technical, business, and research contexts for a trial or experiment that verifies feasibility or a concept.
新技術の実証実験が来月始まる。
A proof-of-concept experiment for the new technology will begin next month.
このプロジェクトはまだ実証実験の段階です。
This project is still at the verification test stage.
実験 is a general 'experiment'; 実証実験 narrows it to a proof-of-concept or verification experiment.
Compound of 実証 (verification, demonstration) and 実験 (experiment).