Why are the two words proprietor (proprietory) propriety so similar but with completely different meanings?

proprietary

adj.

1.Of or relating to a proprietor or to proprietors as a group:

Owner’s: Belonging to or related to one owner or owners as a group: proprietary rights. Ownership 2.Exclusively owned; private:

Private: Exclusively owned; Private: a proprietary hospital. A private hospital

3.Befitting an owner:

Owned by a private individual or corporation under a trademark or patent:

Proprietary, patented: owned by an individual or company under a patented trademark or patent: a proprietary drug. A proprietary drug n. (noun) plural pro.pri .e.tar.ies

.1.A proprietor.

Owner: Owner

2.A group of proprietors.

A group of owners

3.Ownership; proprietorship.

Ownership: possession; ownership

4.A proprietary medicine.

Monopoly medicine

5.One granted ownership of a proprietary colony.

Lord: The person who has exclusive ownership of a colony

Etymology: 1.From Middle English proprietarie [ owner of property]

From Middle English proprietarie [owner of property]

2.from Old French proprietaire

From Old French proprietaire

3.and from Medieval Latin propriet?rius

And from Medieval Latin propriet?rius

4.both from Late Latin [of a property owner]

Both come from late Latin [belonging to the owner of property]

5.from Latin propriet?s [ownership] * see property

From Latin propriet? s [possession right] *See property

proprietor

n. noun

1.One who has legal title to something; an owner.

Owner: A person who has legal ownership of something; owner 2. One who owns or owns and manages a business or other such establishment.

Owner: A person who possesses, or owns and manages a business or other such establishment. A person in a company or other corporate organization

Etymology:

Probably alteration of Middle English propr

ietarie * see proprietary

Possibly a variation of Middle English proprietarie *see proprietary

propriety

n. (noun) plural pro.pri.e.ties< /p>

1.The quality of being proper; appropriateness.

proper: suitable characteristics; appropriate

2.Conformity to prevailing customs and usages.See Synonyms at etiquette

Decent: consistent with popular customs and habits. See etiquette

3.proprieties The usages and customs of polite society.

proprieties Etiquette: of civilized society. Customs and habits

Etymology:

1.Middle English propriete [particular character, ownership]

Middle English propriete [characteristic; ownership]

It can be seen that they are actually the same etymology. The meanings are related, not completely different.