Retardation; delay. / (music) A slowing down of the tempo; a ritardando. / (offensive, dated) A person with mental retardation.

(transitive) To keep delaying; to continue to hinder; to prevent from progressing. / (transitive) To put off; to postpone. / (transitive, obsolete) To be slow or dilatory to perform (something).

(topology) A subspace such that there is a retraction onto it of the ambient space homotopic to the identity function on the ambient space.

To have a deformation retract as a subspace.

a measure of the average length of time that a soluble compound remains in a constructed reactor

plural of hydraulic retention time

The salinity gradient energy retrieved from the difference in the salt concentration between seawater and river water.

A dog of a medium to large breed, popular as guide dogs and in other service.

Alternative letter-case form of Golden Retriever

To have a deformation retract as a subspace.