As a noun reversion

is reversion.

As an adjective undefined is

lacking a definition or value.

As a proper noun russell

is from the norman nickname for someone with red hair.

As an adjective undefined is

lacking a definition or value.

As a noun notch

is a v-shaped cut.

As a verb notch

is to cut a notch in (something).

As an adjective undefined is

lacking a definition or value.

As a noun porchetta

is a savory and moist boneless pork roast, part of italian cuisine.

As an adjective undefined is

lacking a definition or value.

As a noun affiant

is (legal) the individual witness whose statement is contained in an affidavit or sworn deposition.

As an adjective undefined is

lacking a definition or value.

As a noun issues

is .

As a verb issues

is (issue).

As an adjective undefined is

lacking a definition or value.

As adjectives the difference between copper and undefined

is that copper is made of copper while undefined is lacking a definition or value.

As a noun copper

is (lb) a reddish-brown, malleable, ductile metallic element with high electrical and thermal conductivity, symbol cu, and atomic number 29 or copper can be (slang|law enforcement) a police officer.

As a verb copper

is to sheathe or coat with copper.

As adjectives the difference between blah and undefined

is that blah is (informal) dull; uninteresting; insipid while undefined is lacking a definition or value.

As a noun blah

is (uncountable|informal) nonsense; drivel; idle, meaningless talk.

As an interjection blah

is an expression of mild frustration.

As a verb blah

is to utter idle, meaningless talk.

As a noun eves

is .

As an adjective undefined is

lacking a definition or value.

As a noun immunoproteasome

is (biochemistry) a proteasome assembled using alternative β form subunits in response to pro-inflammatory signals.

As an adjective undefined is

lacking a definition or value.