Definitions

1. noun

a person who is not intellectually or physically able to learn or perform as expected, especially a person with an intellectual disability.

“The charity aimed to provide education and support for children with retardation.”

2. verb

to slow down or hinder the progress or development of something.

“The lack of funding will retard the project’s completion.”

3. verb (archaic or poetic)

to bring or come to a stop or slow down.

“The rain will retard the traveler’s journey.”