副词

1. 顺便谈及;顺便提一下
You use incidentally to introduce a point which is not directly relevant to what you are saying, often a question or extra information that you have just thought of.

2. 附带地;伴随地
If something occurs only incidentally, it is less important than another thing or is not a major part of it.

1. introducing a different topic
in point of fact

e.g. incidentally, I won't go to the party

Synonym: by the wayby the byeapropos

2. of a minor or subordinate nature

e.g. these magnificent achievements were only incidentally influenced by Oriental models

Synonym: accidentally