What is intercede?

Some articles on intercede:

Intercession Of Saints - Biblical Basis
... who have died but are alive in Christ may be able to intercede on behalf of the petitioner(John 1125Romans 838–39). 211Hebrews 1 ... Timothy 21–5) it is argued that if those living here on earth can intercede on behalf of each other, then those already glorified in Heaven, and even closer "in ...