Patient Handouts. 1  Acute coronary syndrome (Medical Encyclopedia) Also in Spanish. 2  Angioplasty and stent - heart - discharge (Medical Encyclopedia) Also in Spanish. 3  Angioplasty and stent placement - heart (Medical Encyclopedia) Also in Spanish. 4  Coronary angiography (Medical Encyclopedia) Also in Spanish.
Wiktionary(0.00 / 0 votes)Rate this definition: 1  influential(Noun) A person who has influence. 2  influential(Adjective) Having or exerting influence. John Lennon was a very influential person in music, as well as in politics, fashion and general culture.
Word Origin & History. affect 14c., mental state, from L. affectus, pp. of afficere act on, have influence on, to do something to, a verb of broad meaning, from ad- to + facere (pp. factus) do (see factitious). The verb meaning to make an impression on is attested from 1630s.