establish
verb
ɪˈstæblɪʃ 
ɪˈstæblɪʃ 
1 establish something to start or create an organization, a system, etc. that is meant to last for a long timeSynonym
set upThe committee was established in 1912.The new treaty establishes a free trade zone.Let's establish some ground rules.2 establish something to start having a relationship, especially a formal one, with another person, group or countryThe school has established a successful relationship with the local community.3 establish somebody/something/yourself (in something) (as something) to hold a position for long enough or succeed in something well enough to make people accept and respect youBy then she was established as a star.He has just set up his own business but it will take him a while to get established.4 establish something to make people accept a belief, claim, custom etcIt was this campaign that established the paper's reputation.Traditions get established over time.5 to discover or prove the facts of a situationSynonym
ascertainestablish something Police are still trying to establish the cause of the accident.establish that… They have established that his injuries were caused by a fall.establish where, what, etc… We need to establish where she was at the time of the shooting.it is established that… It has since been established that the horse was drugged.