One shape laid on top of another, with nothing sticking out anywhere along the edge. Congruent can be thought of as that moment of fitting: two things brought together and no gap, no clash, nothing left over.
可以想成把一個東西疊到另一個上面，邊邊角角都對得上，沒有一處凸出來。congruent 的各種意思，就像都從這個「疊上去剛好合」的畫面長出來：在數學裡是圖形真的重合；在一般用法裡，是兩個想法、兩份說法擺在一起不打架；在數論裡，則是兩個數字放進同一個除數裡，落在同一個位置上。
From the word’s history
Latin congruo meant to meet together, to agree: two sides coming to the same point. The modern word still keeps that meeting point.
拉丁文 congruō 的意思是「一起走到、彼此相合」。可以想成兩邊各自走過來，在同一點碰上。今天的 congruent 還守著這個碰頭的畫面。
Wiktionary entry supplied in this batch's evidence packet (source_ref kaikki:3f6f69a190036ae4:840697552): from Latin congruens, present active participle of congruo (meet together, agree).
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