The Longest Block in the autosomal Family Finder test refers to the the longest continuous segment of autosomal DNA that is shared between two individuals.

A locus is a specific location in your genetic code. In a genetic map of our DNA, the locus tells us where to find any base. Each locus is named sequentially so that on chromosome [...]

A lineage is all descendants of a specific ancestor.

A descendant of the Hebrew tribe of Levi. There are strict historic guidelines for who is considered a Levite.