形容詞 coincident:

1. occurring or operating at the same time
   同義詞：coincidental, coinciding, concurrent, co-occurrent, cooccurring, simultaneous
2. matching point for point
   同義詞：coinciding

1. The culture areas are essentially coincident with language areas.
   文化區(qū)與語言區(qū)基本重合。

co.in.ci.dent

adj.（形容詞）
Occupying the same area in space or happening at the same time:
同時(shí)發(fā)生的：在空間占據(jù)相同區(qū)域或在同一時(shí)間發(fā)生的：
例句：
a series of coincident events.See Synonyms at contemporary
一系列同時(shí)發(fā)生的事件參見 contemporary

Being very similar to another, as in nature:
相似的：與另一個(gè)非常相似，如在性質(zhì)上：
例句：
testimony that was coincident with the actual facts.
與事實(shí)相符合的證據(jù)

Matching point for point; coinciding:
符合的：點(diǎn)與點(diǎn)相符合的；重合的：
例句：
coincident circles.
重合圓