Refers to a business or person from whom goods or materials are purchased; common in commercial and procurement contexts.
We are looking for a new supplier.
Who is the supplier for this part?
Standard spelling with full okurigana; preferred in modern usage.
Irregular okurigana variant; less common but still encountered.
Compound of 仕入れ (purchasing, stocking) from verb 仕入れる, and 先 (destination, source). Literally 'purchasing source'.