Can please explain "extreme unction" here? And what does " observe extreme unction" mean? Is it held often in modern society?
When a Roman Catholic or High Anglo Catholic is dying, a priest carries out the rite of "Extreme Unction" or "The Last Rites", in which the person is spiritually prepared for death.
It is a complex rite: CATHOLIC ENCYCLOPEDIA: Extreme Unction
It is therefore not a term in "daily use", but well understood by those who are in the Churches concerned.