From丁福保佛學大辭典(Ding Fubao's Dictionary of Buddhist Studies): 境【術語】心之所遊履攀緣者，謂之境。如色為眼識所遊履，謂之色境。乃至法為意識所遊履，謂之法境。俱舍頌疏一曰：「色等五境為境性，是境界故。眼等五根名有境性，有境界故。」實相之理，為妙智遊履之所，故稱為境。是屬於前之法境。玄義二上曰：「以境妙故，智亦隨妙。以法常故，諸佛亦常。函蓋相稱，境智不可思議。」
I started something but what I have done is too lousy. Looks like I need to learn more.
境 (visaya) 【術語】 [Technical Term]
Where the mind (citta) perceives and clinging on, that is named as "境".
For example, materiality (rupa) perceives by the eye-perception, that is named as "色境" (rupa visaya).
So does, mental object (dharma) perceives by the consciousness, that is named as "法境" (dharma visaya).
The "Commentary and Explanation of Abhidharma-kosa-sastra" said：
"materiality and the rest of the five external objects ... "
The reality ...