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They both translate to agreement, but I can't quite figure out what the
difference is. Based on the answer
[here](https://hinative.com/ja/questions/7080945), 合意 implies that there was
some effort from both parties (e.g., negotiation, compromise) for an agreement
to take place, but 同意 doesn't give that nuance.

Also, how did 合 and 同 contribute to the meaning of these 熟語? 同 means same, so
it makes sense, but understanding 合 is a bit hard. Is it closer to 合う or to
合わせる？
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2020-06-05T13:48:34.987
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2020-06-08T03:02:17.100
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question
word-choice nuances
What's the difference between 合意 and 同意？
You pretty much answered it on your own, but let me spell it out for
completness sake:

The easiest way to put it is probably the difference between "coming to an
agreement" and "being in agreement".

合意 is made up of 合う (match, meet) and 意 (opinion) which implies that there was
some effort put into making opinions match that were originally different. If
I tell my friend that chocolate is the best ice cream flavour and they argue
that strawberry tastes better, and after some discussion we agree that both
taste great, we have come to an agreement (合意).

同意 on the other hand literally means "same(同) opinion(意)". If I tell my frined
that choclate is the best ice cream flavour and they are like "Yes, totally",
we are in agreement (同意).

If you make an argument, I might tell you "I agree" either because you have
convinced me (合意する) or because I was thinking the same thing (同意する)

Both can be translated to "Agreeing, Agreement" but they give more insight in
how that agreement was reached.
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2020-06-06T02:21:19.243
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answer