What does "conclusion" mean?

1. (the end) the final part or the finish of something like a book, a speech, or an event. 2. (a decision or opinion) a judgment or opinion you reach after thinking about all the information. 3. (logic) the final statement in an argument that must be true if the other statements are true. 4. (a formal agreement) the final act of finishing a formal agreement or a business deal.

Is it correct to say "I reached to the conclusion that he was lying."?

No — say "I reached the conclusion that he was lying.". The phrase is 'reach a conclusion' or 'come to a conclusion'. Do not use 'reach to'.

conclusion

US //kənˈkɫuʒən// UK //kənklˈuːʒən// con·clu·sion

1 the end (n.)
B1 Intermediate

the final part or the finish of something like a book, a speech, or an event.

the terminal part or close of a narrative, event, or period of time.

Example

The conclusion of the movie was very sad and made everyone cry.

Example

At the conclusion of the symphony, the audience remained silent for several seconds before erupting into applause.
2 a decision or opinion (n.)
B1 Intermediate

a judgment or opinion you reach after thinking about all the information.

a reasoned judgment or decision reached after consideration of evidence or facts.

Example

After looking at the evidence, the police reached the conclusion that the fire was an accident.

Example

The researchers came to the conclusion that the new drug was no more effective than the existing treatment options.
Pitfall

I reached to the conclusion that he was lying.

I reached the conclusion that he was lying.

The phrase is 'reach a conclusion' or 'come to a conclusion'. Do not use 'reach to'.

Show 2 more sensesShow fewer

3 logic (n.)
B2 Upper Intermediate Academic Math

the final statement in an argument that must be true if the other statements are true.

the proposition in a syllogism or logical argument that is inferred from the premises.

Example

If all men are mortal and Socrates is a man, the conclusion is that Socrates is mortal.

Example

The philosopher argued that the conclusion did not necessarily follow from the premises provided in the opening statement.
- inference
- deduction
- premise
4 a formal agreement (n.)
C1 Advanced Formal Law

the final act of finishing a formal agreement or a business deal.

the formal act of settling or arranging a treaty, contract, or deal.

Example

The conclusion of the trade deal took many months of difficult talking.

Example

The successful conclusion of the peace treaty brought an end to three years of border disputes between the two nations.

Origin

From Middle English, borrowed from Old French conclusion, from Latin conclūsiō, from the past participle stem of conclūdere (“to conclude”), from con- + claudō, ultimately from Proto-Indo-European *kleh₂u- (“key, hook, nail”). By surface analysis, conclude + -sion.