ChristianAnswers.Net WebBible Encyclopedia
means of grace
an expression not used in Scripture, but employed…
to denote those institutions ordained by God to be the ordinary channels of grace to the souls of men. These are the Word, Sacraments, and Prayer.
But in popular language, the expression is used in a wider sense to denote those exercises in which we engage for the purpose of obtaining spiritual blessing; as hearing the gospel, reading the Word, meditation, self-examination, Christian conversation, etc.