Dictionary

Put into practical use.

Of a branch of science, serving another branch of science or engineering.

To lay or place; to put (one thing to another)

Example: to apply cream to a rash

To put to use; to use or employ for a particular purpose, or in a particular case

Example: to apply funds to the repayment of a debt

To make use of, declare, or pronounce, as suitable, fitting, or relative

Example: We need to apply the skills we've learned to solve this problem

To put closely; to join; to engage and employ diligently, or with attention