What is the meaning of Portmanteau?

A large travelling case usually made of leather, and opening into two equal sections.

A schoolbag.

A hook on which to hang clothing.

Made by combining two (or more) words, stories, etc., in the manner of a linguistic portmanteau.

A word formed by putting two words together and thereby their meaning e.g. shrinkflation.

A portmanteau film.

To create a portmanteau word.

Source: wiktionary.org