From BiblePortal Wikipedia

Webster's Dictionary [1]

(1): ( a.) Contained in, or relating to, the four Gospels; as, the evangelical history.

(2): ( a.) Belonging to, agreeable or consonant to, or contained in, the gospel, or the truth taught in the New Testament; as, evangelical religion.

(3): ( a.) Earnest for the truth taught in the gospel; strict in interpreting Christian doctrine; preeminetly orthodox; - technically applied to that party in the Church of England, and in the Protestant Episcopal Church, which holds the doctrine of "Justification by Faith alone"; the Low Church party. The term is also applied to other religion bodies not regarded as orthodox.

(4): ( n.) One of evangelical principles.

Charles Buck Theological Dictionary [2]

Agreeable to the doctrines of Christianity. The term is frequently applied to those who do not rely upon moral duties as to their acceptance with God; but are influenced to action from a sense of the love of God, and depend upon the merits of Christ for their everlasting salvation.

Cyclopedia of Biblical, Theological and Ecclesiastical Literature [3]

appertaining to, or characteristic of, the Gospel.

(1.) The term "has been applied to a portion of the English Church who either profess, or are supposed to know and inculcate the Gospel in an especial manner, and to give peculiar prominence to the doctrine of salvation by faith in the atonement. It is probably true that among this portion of the Church of England many, but not all maintain the peculiar doctrines of Calvinism; and there may have been a time when (in the opinion of some) lower views of the sacraments and of Church authority prevailed among them than what are generally received among other members of that Church. Very many persons lament the use of this term, and consider that, like all party appellations, it tends to perpetuate division in the Church; accordingly, they desire that it should be disused as a party term, and carefully confined to its original meaning" (Eden).

(2.) In Prussia, the United Established Church (since 1817) has been called the "Evangelical Church." (See Prussia And United Evangelical Church).

(3.) In England and America the term "evangelical" is frequently used to distinguish those churches which believe in the divinity of Christ and the atonement from those that do not.

The Nuttall Encyclopedia [4]

A term applied to all those forms of Christianity which regard the atonement of Christ, or His sacrifice on the Cross for sin, as the ground and central principle of the Christian faith.