forty-five-degree
UK[ˈfɔːti faɪv dɪˈɡriː]US[ˈfɔːrti faɪv dɪˈɡriː]
adj
Describing an angle equal to one-eighth of a full circle.
adj
Describing a direction or orientation that is exactly halfway between horizontal and vertical.
Morpheme Breakdown
forty
five
degree
forty
four tens
five
degree
Etymology
The term "forty-five-degree" is a modern English compound formed by combining three distinct lexical elements. The numerals "forty" and "five" are of Old English origin, descending from the Germanic numeral system. "Degree" entered English via Old French from the Latin 'degradus', literally meaning "a step down". In geometry, a "degree" represents a step or unit in the measurement of a circle. The compound logically specifies an angle of 45 steps out of the 360 that constitute a full rotation, precisely bisecting the right angle. This construction exemplifies the analytical nature of English, where precise numerical and measurement terms are combined transparently to create technical descriptors.
Analysis
Structure: forty + five + degree
forty: From Old English 'feowertig', meaning "four tens". In this compound, it functions as a numeral.
five: From Old English 'fīf', meaning the number after four. In this compound, it functions as a numeral.
degree: From Old French 'degre', ultimately from Latin 'de-' (down) + 'gradus' (step). In this compound, it functions as a noun meaning a unit of measurement for angles.
Examples
The carpenter cut the wood at a forty-five-degree angle to create a miter joint.
The road makes a sharp forty-five-degree turn just ahead.
Position the mirror at a forty-five-degree angle to reflect the light onto the ceiling.