Graeme's Lexicon of Nomenclature 

A glossary of family research terms/tips compiled by Family Research class member Graham M.
Agnate
  1. A relative whose relation is traced only through male members of the family.
  2. Any paternal male relative
Ahnentafel
Sosa
Sosa--Stradonitz
In an Ancestral Chart, you are always 1.  Your father is 2 and his father is 4 and successive fathers always double the last number used.  
    2                    4                                8                            16                  32
Father        Grandfather        Great Grand Father         GGGF         GGGGF
Females:
    3                    45                              9                              17                33
The wife is always the next number
This method will provide you with a complete direct lineage.  
​All ancestry charts use this.

Ampersand
The Ampersand is used in writing code and so will sometimes appear in unexpected places.  Graham suggests typing 'and' when this occurs.  
Coterminous
 Having same boundaries or extent (in space, time or meaning).
​Disambiguation
The act or process of distinguishing between similar things, meanings, names, etc., in order to make the meaning or interpretation more clear or certain:
Word sense - disambiguation helps determine which meaning a word has in any given context.
 
Eg MORRIS
  1. Surname
  2. Motor Car
  3. Dance
  4. Rifle.
Enate
  1. A relative whose relation is traced only through the female members of the family.
  2. Any maternal female relative.

Grand or Great?
According to Family Tree Magazine the proper term for your grandparents' siblings is grandaunt or grand uncle, just  like grandparent.  Grand means that the relatives in question are two generations removed from one another.
So aunts and uncles follow the same pattern as parents as you tack on generations:
  • parent aunt/uncle
  • grandparent grandaunt/granduncle
  • great-grandparent great-grandaunt/great-granduncle
  • great-great-grandparent great-great-grand aunt/great-great-granduncle

​And so on. “It’s a mistake to lump [grandaunts and granduncles] in with the greats,” says Jackie Smith Arnold in Kinship: It’s All Relative, 2nd edition (Genealogical Publishing Co.). “Mixing the generations causes confusion.” 

​Source:  Family Tree Magazine:  https://familytreemagazine.com/general-genealogy/aunts-and-uncles-grand-not-great/