(1)
(罗马法)农业或制造业中的雇工

(2)(英格兰古法)奴隶
共四种，一为卖身为奴者，二为债务奴，三为战俘奴，四为天生奴。另外还有一种「servi testamentales」,后世称为「契约奴」〔covenant-servants〕。

• prosocer
• prosocerus
• pro socio
• pro solido
• prospective
• prospective damages
• prospective heir
• prospective law
• prospective price redetermination
• prospective statement
• prospective statute
• prospectus
• prostitute
• prostitution
• pro suo
• pro tanto
• pro tanto acquittance
• pro tanto ademption
• pro tanto validation
• protect
• protected class
• protected state
• protected tenancy
• protecting commercial paper
• protection