Intercession \In`ter*ces"sion\, n. [L. intercessio an intervention, a becoming surety: cf. F. intercession. See Intercede.]

The act of interceding; mediation; interposition between parties at variance, with a view to reconcilation; prayer, petition, or entreaty in favor of, or (less often) against, another or others.

But the Spirit itself maketh intercession for us with groanings which can not be uttered. --Rom. viii. 26.

Source: Webster's Revised Unabridged Dictionary (1913)