Princeton's WordNet(1.00 / 2 votes)Rate this definition: Wiktionary(2.67 / 3 votes)Rate this definition: infinity(Noun) Limitlessness, unlimitedness, something which is growing without limits or bounds. infinity(Noun) A number that has an infinite numerical value that cannot be counted.
univalve (mollusk) a class of mollusks typically having a 1-piece coiled shell and flattened muscular foot with a head bearing stalked eyes. animal noun (animals and microorganisms) univalves.
Noun. 1. electron shell-a grouping of electrons surrounding the nucleus of an atom; the chemical properties of an atom are determined by the outermost electron shell. group, grouping-any number of entities (members) considered as a unit.oun. 1. electron shell-a grouping of electrons surrounding the nucleus of an atom; the chemical properties of an atom are determined by the outermost electron shell. group, grouping-any number of entities (members) considered as a unit.