service /ᶥsᴈ:ᴠɪs; NAmE ‘sɛ:rᴠ-/ noun, verb noun · PROVIDING STH 1. a system that provides sth that the public needs, organized by the government or a private company […] at the service of sb/sth | at sb’s service completely available for sb to use or to helb sb […]. be of service (to sb) (formal) to be useful or helpful […] work for organization […] [U] ~(to sth) the work that sb does for a long time or is admired very much […]. skills/help […] [usually pl.] (formal) the particular skills or help that a person is able to offer […]
expertise /ᶥekspᴈ:ᶦti:z; NAmE -pᴈ:rᶥt-/ noun [U] expert knowledge or skill in a particular subject, activity or job: professional/scientific/technical, etc. expertise ◊ We have the expertise to help you run your business.