Merism is a figure of speech in which a person refers to something by speaking of two extreme parts of it. By referring to the extreme parts, the speaker intends to include also everything in between those parts.
> "I am the Alpha and the Omega," says the Lord God, "the one who is, and who was, and who is to come, the Almighty." (Revelation 1:8, ULB)
> I am the <u>Alpha and the Omega</u>, <u>the First and the Last</u>, <u>the Beginning and the End</u>. (Revelation 22:13, ULB)
<u>Alpha and Omega</u> are the first and last letters of the Greek alphabet. This is a merism that includes everything from the beginning to the end. It means eternal.
>I praise you, Father, Lord of <u>heaven and earth ...</u>, (Matthew 11:25 ULB)
<u>Heaven and earth</u> is a merism that includes everything that exists.
Some languages do not use merism. The readers of those languages may think that the phrase only applies to the items mentioned. They may not realize that it refers to those two things and everything in between.