The Latin pater means “father.” It produced the stems pater-, patr-, and indirectly patron- in English.

Here are some important descendants:

Word Origin / Literal idea Modern meaning
Paternal paternus — “of a father” relating to a father
Paternity paternitas fatherhood
Paternalism from paternal treating others as a father might, especially by making decisions for them
Paterfamilias pater familias — “father of the household” male head of a family
Patrimony patrimonium — property inherited from a father inherited property or heritage
Patrimonial from patrimonium relating to inherited property or heritage
Patrician patricius, from patres (“fathers”) member of the Roman aristocratic class; later, an aristocrat
Patricide pater/patr- + -cide killing one’s father
Patron Latin patronus, ultimately connected with pater protector, supporter, or customer
Patronage from patron support given by a patron
Patronize from patron originally “act as a patron”; also “treat condescendingly”
Patroness feminine of patron female patron
Patria Latin patria — “fatherland” one’s native country
Expatriate ex + patria — “out of the fatherland” someone living outside their native country
Repatriate re- + patria return someone to their native country
Repatriation from repatriate return to one’s homeland
Patriot related through the ancient “father/fatherland” word family one devoted to one’s country
Patriotism from patriot devotion to one’s country

One particularly interesting connection is patron. In ancient Rome, a patronus was a protector or advocate—someone occupying something like a protective, fatherly social role. That word ultimately belongs to the pater family.

There is also a fascinating chain:

pater → patronus → patron → pattern

Pattern originally came through Old French patron, meaning a model or example to be copied. So surprisingly, “pattern” and “paternal” are distant relatives.

A related group such as patriarch, patriarchal, patriot, patria, patrimony, patrician, patron, paternal, and paternity all carry, historically, some version of the idea of father, ancestry, family, or fatherland—although some entered English through Greek rather than directly through Latin.