n. An assemblage of persons or things; a number of persons or things gathered together with or without regular interconnection or arrangement; a cluster.n. In the fine arts, an assemblage of figures which have some relation to one another and to the general design; a combination of several figures forming a harmonious whole.n. In scientific classifications, a number of individual things or persons related in some definite or classificatory way.n. Specifically— In zoology, any assemblage or classificatory division of animals below the kingdom and above the species: generally said of intermediate or not regularly recognized divisions, or by way of non-committal to the exact taxonomic value of the division thus indicated.n. In geology, a division in the geological sequence or classification of the stratified fossiliferous rocks inferior in value to a system or series. See system.n. In music: A short rapid figure or division, especially when sung to a single syllable.n. A section of an orchestra, comprising the instruments of the same class: as, the wood-wind group.n. In mathematics, a set of substitutions (or other operations) such that every product of operations of the set itself belongs to the set; a system of conjugate substitutions; a set of permutations resulting from performing all the substitutions of a conjugate system upon a series of elements; a set of functions produced by the n operations of a group of operations from n independent functions, called the fundamental system of the group.n. A group of infinitely many but discrete operations, among which infinitely small transformations occur.n. in mathematics, a group whose elements have each k indices, or are arranged in a matrix of k dimensions.n. In Capelli's extended sense, groups which can be separated each into the same number of subgroups, so that a substitution of a subgroup in the one can be so coordinated to one of the other that products shall correspond to products.To form into a group or into groups; arrange in a group or in groups; separate into groups: commonly with reference to the special mutual relation of the things grouped, to classification, or to some special design or purpose, as artistic effect.To fall into combination or arrangement; form a group or part of a group: used chiefly with reference to artistic effect.See groop.n. In the recommendations of the International Geological Congress this term is applied, in geological classification, to stratigraphic divisions of the highest order comprising several terrains. Its equivalent term in the time scale is era.n. In combinatorial analysis, one of the classes into which the objects are distributed when the order of the objects in a particular class is material.n. In group-theory, a set of definite operations containing the operation compounded of any two of the set, and also the inverse of every operation of the set.n. In crystallography, a class of crystals characterized by the same degree of symmetry. Each crystalline system embraces several such groups or classes. See symmetry, where the names commonly employed in designating the more important of these groups are given.n. In ethnology, a number of people united together by common habits and usages.