concur

Compared meaning: to have the same opinion (verb).

比较义项：同意（动词）。

• agree

  The everyday, neutral word for sharing an opinion; used in casual conversation and writing, with people, groups, or ideas, and works with prepositions like 'with', 'on', or 'that'.

  这是表示“持相同意见”最常用、最中性的词，口语和书面语都可以用，可以用于人、团体或观点，常搭配介词 with、on 或 that。

  We finally agree on where to go for vacation this summer.

  我们终于就今年夏天去哪里度假达成了一致意见。

• concur 本词

  A formal, mostly written word, typical of experts, officials, or reports agreeing with a finding or opinion; rarely used in casual everyday speech.

  这是一个正式、多用于书面语的词，常见于专家、官员或报告对某项结论或意见表示一致，很少用于日常口语。

  Most of the doctors concur that the patient needs more rest.

  大多数医生都一致认为病人需要更多休息。

Agree and concur both mean to have the same opinion. Agree is the everyday, neutral word, used casually with people, groups, or ideas. Concur is formal and mostly written, typical of experts or reports agreeing. Not compared: agree meaning to arrange or settle something.

agree 和 concur 在“同意”这一意义上很接近，但 concur 更正式、更书面化，常见于专家、官员或报告之间的一致意见；agree 是日常口语和书面语都通用的词。这里不比较 agree 的其他用法，例如“约定、商定”（如 agree on a price）。

Compared meaning: to happen at the same time (verb).

比较义项：同时发生（动词）。

• coincide

  The everyday, neutral word for two events happening at the same time; common in speech and writing about dates, schedules, or plans.

  coincide是日常、中性的用词，用来表示两件事恰好同时发生，常用于谈论日期、日程或计划。

  The two concerts coincide, so I can only attend one of them.

  这两场音乐会时间恰好重合，所以我只能去参加其中一场。

• concur 本词

  A formal, literary word, often used of abstract factors or circumstances that combine at the same time; today it usually means 'agree' instead.

  concur是正式、文学化的用词，常用来说抽象的因素或情况恰好同时凑到一起；如今它更常用来表示“同意”这一意思。

  Several unfortunate factors concurred to make the launch a complete failure.

  有几个不利因素恰好同时凑到了一起，导致这次发射彻底失败。

Coincide and concur can mean to happen at the same time. Coincide is the everyday word, common in speech about dates or schedules. Concur is formal and literary here, mostly for abstract factors combining, and is rare today. Not compared: concur's common meaning, to agree.

这两个词都可以表示两件事恰好同时发生，但语体差别明显：coincide是日常用词，concur在这个意思上是正式、文学化的说法，如今很少见。这里不比较concur更常见的“同意”这一义项。