In plain English
FAR 52.202-1, Definitions, is a contract clause prescribed at FAR 2.201, most recently dated Jun 2020. The complete official text is reproduced below, verbatim, from GSA's published FAR source files.
Its text contains no sentence requiring insertion into subcontracts; see the flowdown section below for what that does and does not mean.
Does it flow down to subcontracts?
No flowdown mandate found in the clause text
We scanned the full clause text and found no sentence directing the contractor to insert this clause into subcontracts. That is a statement about the text, not legal advice: a prime contractor may still flow terms down contractually, an agency supplement (DFARS, VAAR, …) may add requirements, and clauses listed below (if any) may order this clause into subcontracts from the outside.
Where it's prescribed
As prescribed in 2.201 , insert the following clause:
Prescribing reference: FAR 2.201.
The official text, verbatim
As prescribed in 2.201 , insert the following clause:
Definitions (Jun 2020)
When a solicitation provision or contract clause uses a word or term that is defined in the Federal Acquisition Regulation (FAR), the word or term has the same meaning as the definition in FAR 2.101 in effect at the time the solicitation was issued, unless-
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(a) The solicitation, or amended solicitation, provides a different definition;
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(b) The contracting parties agree to a different definition;
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(c) The part, subpart, or section of the FAR where the provision or clause is prescribed provides a different meaning;
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(d) The word or term is defined in FAR part 31, for use in the cost principles and procedures; or
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(e) The word or term defines an acquisition-related threshold, and if the threshold is adjusted for inflation as set forth in FAR 1.109(a), then the changed threshold applies throughout the remaining term of the contract, unless there is a subsequent threshold adjustment; see FAR 1.109(d).
(End of clause)