annex
Meaning: to add or attach territory, space, or property
Usage: The city voted to annex the land beside the public library.
compound
Meaning: to combine; to make a problem worse by adding to it
Usage: Heavy rain compounded the travel problems before the match.
entail
Meaning: to include as a necessary step
Usage: Building a new fence entails tearing down the old one.
infusion
Meaning: an injection of one substance into another; the permeation of one substance by another
Usage: The infusion of Eastern religion into Western philosophy created interesting new schools of thought.
adhere
Meaning: to stick to something; to follow closely
Usage: He adhered to the rules of his club without complaint.
cleave
contronym: cling/adhere senseMeaning: to cling or adhere closely
Usage: After the argument, the siblings cleaved to one another for support.