What basis do we have for defining Sabbatismos in Hebrews 4:9?

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The word, Sabbatismos occurs in the Greek NT only once.
Strongest Strong’s defines it as Sabbath rest; Sabbath observance.
Thayer’s/Strong’s defines it as a Sabbath keeping.
Various English translations render this a special rest, a day of rest, a Sabbath rest. Young’s Literal Translation renders it a Sabbatic rest.

What basis do we have for defining this word, Sabbatismos in Hebrews 4:9?
Or, more accuratel,y what basis do we have for determining the meaning it was intended to convey.
For example:

-Is there a way of tracing the scholars’ steps in determining the meaning of this Greek word?
-Is this word used in the Septuagint?
-Do we have insight from other Greek writings that contribute to understanding its meaning?
-How do the grammatical elements of this particular form play into our understanding?
-Do any other traditions/languages play into how scholars understand this Greek word?
-What is the etymology of the Greek word?