(5) "Subcontractor" means a person other than an owner having a direct contract with the contractor.

"Subcontractor" means any person who has contracted to furnish labor or materials to, or has performed labor or supplied materials for, a contractor or another subcontractor in connection with a contract to improve real property. For purposes of this chapter, the [...]

(9) "Subcontractor" means, but is not limited to, subcontractors having privity of contract with the contractor.

(12) "Subcontractor" means a person hired by a contractor on an independent basis rather than as an employee and who performs work for the contractor under a contract as provided under subparagraph (A) of paragraph (1) of this Code section.