first-of-its-kind

Adjective

not-comparable uncommon

(uncommon) Unique and exceptionally different. / (uncommon) Something unique which appears in the earliest phases.

Japanese Meaning

これまでに類がなく、非常に独自で異彩を放つ / 初期段階で登場する独特な何か

The research lab unveiled a first-of-its-kind device that can convert seawater into drinking water using only solar power.

研究所は、太陽光だけで海水を飲料水に変える類を見ない装置を発表した。

Sense（1）

(uncommon) Unique and exceptionally different.

Sense（2）

(uncommon) Something unique which appears in the earliest phases.