conclude

complete, finish, end, close, conclude, terminate, accomplish

这些动词均含“结束，完成”之意。
complete: 侧重指完成预定的任务或使某事完善，补足缺少的部分等。
finish: 与complete基本同义，着重圆满地结束或完成已着手的事。
end: 最普通用词，着重事情的完成。也指某种活动因达到目的而自然结束或由于某种原因而突然中止。
close: 普通用词，着重行为的终止或结束，不强调其目的。
conclude: 正式用词，多指以某事或活动达到预期目的而告终。
terminate: 强调有一个空间和时间的限度，届时必须终止。书面语用词。
accomplish: 正式用词，强调一个过程的完成；也可指依靠努力达到一定目的，或取得一定的结果。

infer, deduce, conclude, gather, judge

这些动词均含“推断”之意。
infer: 指从已提供的论据或从已接受的前提出发而推断出的结论。
deduce: 指有充分根据的推论，也指逻辑学上的演绎。
conclude: 指得出符合逻辑的结论。
gather: 指从听到的情况推测、判定。
judge: 多指经过仔细鉴定或评价之后作出决断。

动词 conclude:

1. decide by reasoning; draw or come to a conclusion
   同义词：reason, reason out
2. bring to a close
3. reach a conclusion after a discussion or deliberation
   同义词：resolve
4. come to a close
   同义词：close
5. reach agreement on

1. Once the price had been agreed, a deal was quickly concluded.
   价格一经商定，交易很快就达成了。
2. The concert concluded with the National Anthem.
   音乐会最后以演奏国歌结束。
3. From his appearance we may safely conclude that he is a chain smoker.
   从他的外表，我们可以有把握地断定他烟抽得很凶。

con.clude

v.（动词）
con.clud.ed,con.clud.ing,con.cludes
v.tr.（及物动词）
To bring to an end; close:
使结束；关闭：
例句：
concluded the rally with the national anthem.See Synonyms at complete
大会以国歌作为结束参见 complete

To bring about (a final agreement or settlement):
缔结：达成（最终和约或解决方案）：
例句：
conclude a peace treaty.
订立和平条约

To reach a decision or form an opinion about.See Synonyms at decide
决定：达成决议或形成观点参见 decide
To arrive at (a logical conclusion or end) by the process of reasoning; infer on the basis of convincing evidence:
断定：通过推理得出（逻辑性的结论或结果）；以令人信服的证据推论出：
例句：
The jury concluded that the defendant was innocent.
陪审团断定被告无罪

Obsolete To confine; enclose.
【废语】 关闭；禁闭
v.intr.（不及物动词）
To come to an end; close.
终了；结束
To come to a decision or an agreement.
作出决定或达成协议

来源：
Middle English concluden
中古英语 concluden
from Latin conclôdere
源自 拉丁语 conclôdere
com- [intensive pref.] * see com-
com- [前缀，表加强词义] *参见 com-
claudere [to close]
claudere [结束]

【引伸】
conclud.er
n.（名词）