influence
noun
ˈɪnfluəns 
ˈɪnfluəns 
1 [uncountable, countable] influence (on/upon somebody/something) the effect that somebody/something has on the way a person thinks or behaves or on the way that something works or developsto have/exert a strong influence on somebodythe influence of the climate on agricultural productionWhat exactly is the influence of television on children?2 [uncountable] the power that somebody/something has to make somebody/something behave in a particular wayinfluence (over somebody/something) Her parents no longer have any real influence over her.influence (with somebody) She could probably exert her influence with the manager and get you a job.He committed the crime under the influence of drugs.3 [countable] a person or thing that affects the way a person behaves and thinkscultural influencesinfluence (on somebody/something) Those friends are a bad influence on her.His first music teacher was a major influence in his life.There seem to be several influences at work in (= affecting) his writing.Idioms
under the influence
having had too much alcohol to drink
She was charged with driving under the influence.