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normalis already meant right-angled in classical Latin; for example, angulus normalis appears in the first century text De institutione oratoria (volume XI, paragraph 3.141) by Marcus Fabius Quintilianus.

In a commentary on this text from the fifteenth century this early use of the word "normalis" is explained as "rectus", see screenshot:

"Angulus normalis est idem qui angulus rectus" = "a normal angle is the same as a right angle"

In response to Ketil Tveiten's question: "How did normal come to mean ordinary" : according to this source, the meaning of normal as conforming to common standards seems to be of recent origin (1828?).

normalis already meant right-angled in classical Latin; for example, angulus normalis appears in the first century text De institutione oratoria (volume XI, paragraph 3.141) by Marcus Fabius Quintilianus.

In a commentary on this text from the fifteenth century this early use of the word "normalis" is explained as "rectus", see screenshot:

"Angulus normalis est idem qui angulus rectus" = "a normal angle is the same as a right angle"

In response to Ketil Tveiten's question: "How did normal come to mean ordinary" : according to this source, the meaning of normal as conforming to common standards seems to be of recent origin (1828?).

normalis already meant right-angled in classical Latin; for example, angulus normalis appears in the first century text De institutione oratoria (volume XI, paragraph 3.141) by Marcus Fabius Quintilianus.

In a commentary on this text from the fifteenth century this early use of the word "normalis" is explained as "rectus", see screenshot:

"Angulus normalis est idem qui angulus rectus" = "a normal angle is the same as a right angle"

In response to Ketil Tveiten's question: "How did normal come to mean ordinary" : according to this source, the meaning of normal as conforming to common standards seems to be of recent origin (1828?).

normalis already meant right-angled in classical Latin; for example, angulus normalis appears in the first century text De institutione oratoria (volume XI, paragraph 3.141) by Marcus Fabius Quintilianus.

In a commentary on this text from the fifteenth century this early use of the word "normalis" is explained as "rectus", see screenshot:

"Angulus normalis est idem qui angulus rectus" = "a normal angle is the same as a right angle"

In response to Ketil Tveiten's question: "How did normal come to mean ordinary" : according to this source, the meaning of normal as conforming to common standards seems to be of recent origin (1828?).

normalis already meant right-angled in classical Latin; for example, angulus normalis appears in the first century text De institutione oratoria (volume XI, paragraph 3.141) by Marcus Fabius Quintilianus.

In a commentary on this text from the fifteenth century this early use of the word "normalis" is explained as "rectus", see screenshot:

"Angulus normalis est idem qui angulus rectus" = "a normal angle is the same as a right angle"

normalis already meant right-angled in classical Latin; for example, angulus normalis appears in the first century text De institutione oratoria (volume XI, paragraph 3.141) by Marcus Fabius Quintilianus.

In a commentary on this text from the fifteenth century this early use of the word "normalis" is explained as "rectus", see screenshot:

"Angulus normalis est idem qui angulus rectus" = "a normal angle is the same as a right angle"

In response to Ketil Tveiten's question: "How did normal come to mean ordinary" : according to this source, the meaning of normal as conforming to common standards seems to be of recent origin (1828?).