The word 'ordination' is reserved for the sacramental act which integrates a man into the order of bishops, presbyters [priests], or deacons. ... Catholic doctrine teaches that the degrees of priestly participation (episcopate and presbyterate) and the degree of service (diaconate) are all three conferred by a sacramental act called 'ordination,' that is, by the sacrament of Holy Orders."
~ from Catechism of the Catholic Church, paragraphs 1538 & 1554

The site, www.chicagopriest.com, will connect you with information about being a diocesan priest in the Archdiocese of Chicago.