Crossword puzzle clue "providing with a reference system"

Here are the possible solutions for providing with a reference system clue

Answer
Clue
Relevancy
keying
Clue
Providing with a reference system.
Definition
providing a key for (cryptography)
userinterface
Clue
System-to-system system
indexes
Clue
Reference aids in reference books
Definition
INDEX, to provide with an index
tableofcontents
Clue
Reference reference
roadmap
Clue
Reference guide for a driver with no navigation system: 2 wds.
taxis
Clue
Coordinate system reference
alphacentauri
Clue
Star system closest to the solar system
Closest star system to the solar system

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