1.abundance, in which one delights; opposed to ὑστέρημα, 2 Corinthians 8:14 (13), 14; tropically, of that which fills the heart, Matthew 12:34; Luke 6:45, (Eratosthenes, Plutarch).
2.what is left over, residue, remains: plural Mark 8:8.
Matthew 12:34 - N-GNS GRK:γὰρ τοῦ περισσεύματος τῆς καρδίας NAS: speaks out of that which fills the heart. KJV: out of the abundance of the heart INT: indeed the abundance of the heart
Mark 8:8 - N-ANP GRK:καὶ ἦραν περισσεύματα κλασμάτων ἑπτὰ NAS: large baskets full of what was left over of the broken pieces. KJV: of the broken [meat] that was left seven INT: And they took up over and above of fragments seven
Luke 6:45 - N-GNS GRK:ἐκ γὰρ περισσεύματος καρδίας λαλεῖ NAS: speaks from that which fills his heart. KJV: for of the abundance of the heart his INT: out of indeed the abundance of his heart speaks
2 Corinthians 8:14 - N-NNS GRK:τὸ ὑμῶν περίσσευμα εἰς τὸ NAS: time your abundance [being a] [supply] for their need, KJV: your abundance [may be a supply] for INT: your abundance for the