Crossword puzzle clue "it may involve an exchange of letters"

Here are the possible solutions for it may involve an exchange of letters clue

Answer
Clue
Relevancy
code
Clue
It may involve an exchange of letters
Definition
to convert into symbols
nontaxation
Clue
Period that doesn't involve levies or charges (almost, except for letters 3 and 9)
aerobicexercise
Clue
It may involve a step
aerobics
Clue
Class that may involve a step
Definition
exercise for conditioning the heart and lungs
airtravel
Clue
It may involve connections
area
Clue
It may involve pi
Definition
(Latin) a region
aria
Clue
One may involve scales at La Scala
Definition
(Italian) an accompanied vocal solo
arson
Clue
It may involve match play
Definition
the malicious or fraudulent burning of property

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