simple
Uncomplicated; lacking complexity; taken by itself, with nothing added.
Free from duplicity; guileless, innocent, straightforward.
Undistinguished in social condition; of no special rank.
(archaic) Trivial; insignificant.
(now colloquial, euphemistic) Feeble-minded; foolish.
(heading, technical) Structurally uncomplicated.
(chemistry, pharmacology) Consisting of one single substance; uncompounded.
(algebra, of an algebraic structure) Being non-trivial, and admitting no proper non-trivial quotients.
(group theory, of a group) Being non-trivial, and having no proper non-trivial normal subgroups (equivalently, no proper non-trivial quotient groups).
(module theory, of a module) Being non-trivial, and having no proper non-trivial submodules (equivalently, no proper non-trivial quotient modules).
(ring theory, of a ring) Being non-zero, and having no proper non-zero two-sided ideals (equivalently, no proper non-trivial quotient rings). For commutative rings, this definition coincides with that of a field.
(universal algebra, of an algebraic structure) Containing more than one element, and such that the only congruences on the structure are the diagonal relation (the equivalence relation a ≡ b ⟺ a = b) and the universal relation (the equivalence relation such that a ≡ b for all a , b). Equivalently, containing more than one element and having no proper non-trivial quotient algebras.
(category theory, of an object in a category with a terminal object) Being non-isomorphic to the terminal object, and such that its only quotient objects (up to isomorphism) are the terminal object and itself.
(algebra, of a Lie algebra) Being non-abelian and having no proper non-zero ideals.
(mathematics, real analysis, measure theory, of a real-valued function) Equal to a finite linear combination of indicator functions on measurable sets.
(botany) Not compound, but possibly lobed.
(of a steam engine) Using steam only once in its cylinders, in contrast to a compound engine, where steam is used more than once in high-pressure and low-pressure cylinders.
(zoology) Consisting of a single individual or zooid; not compound.
(mineralogy) Homogenous.
(pharmacology) A herbal preparation made from one plant, as opposed to something made from more than one plant.
(obsolete, by extension) A physician.
(logic) A simple or atomic proposition.
(obsolete) Something not mixed or compounded.
(weaving) A drawloom.
(weaving) Part of the apparatus for raising the heddles of a drawloom.
(Roman Catholicism) A feast which is not a double or a semidouble.
(archaic) To gather simples, i.e. medicinal herbs.
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