“prōprius” and this where things get weird. “From prō- +‎ Proto-Italic prijos, from Proto-Indo-European priHós. Cognate with English free. Others suggestions are: for prōprīvus, from prīvus or ultimately from this root. for prōpatrius, from prō- + pater, meaning “from one’s forefathers”, taking Ancient Greek προπάτωρ (propátōr, “forefather”) as comparison.” So apparently there’s controversy. Is it from privus, where “private” came from? or “from one’s forefathers”? Still, it’s the correct word. adjective definition is: 1) own, individual 2) special, particular, characteristic and 2) is the usage I’m looking for in “properties of”. Characteristics of things. What makes it special.

“properties of” -> etymology of “property” -> “proper” -> “prōprius” and this where things get weird.

“From prō- +‎ Proto-Italic *prijos, from Proto-Indo-European *priHós. Cognate with English free.

Others suggestions are:

for *prōprīvus, from prīvus or ultimately from this root.

for *prōpatrius, from prō- + pater, meaning “from one’s forefathers”, taking Ancient Greek προπάτωρ (propátōr, “forefather”) as comparison.”

So apparently there’s controversy. Is it from privus, where “private” came from? or “from one’s forefathers”?

Still, it’s the correct word.

adjective definition is:

1) own, individual

2) special, particular, characteristic

and 2) is the usage I’m looking for in “properties of”. Characteristics of things. What makes it special.