Noun

(en-noun)

An outline or image universally applicable to a general conception, under which it is likely to be presented to the mind (for example, a ).

(databases) A formal description of the structure of a database: the names of the tables, the names of the columns of each table, and the data type and other attributes of each column.

(markup languages) A formal description of data, data types, and data file structures, such as for XML files.

(logic) A formula in the language of an axiomatic system, in which one or more schematic variables appear, which stand for any term or subformula of the system, which may or may not be required to satisfy certain conditions.

Noun

(en noun)

A plan, drawing, sketch or outline to show how something works, or show the relationships between the parts of a whole.

*{{quote-magazine, date=2012-03

, author= , title=Pixels or Perish , volume=100, issue=2, page=106 , magazine= citation , passage=Drawings and pictures are more than mere ornaments in scientific discourse. Blackboard sketches, geological maps, diagrams of molecular structure, astronomical photographs, MRI images, the many varieties of statistical charts and graphs: These pictorial devices are indispensable tools for presenting evidence, for explaining a theory, for telling a story.}}

Electrical diagrams show device interconnections.

A graph or chart.

(category theory) A functor from an index category'' to another category. The objects and morphisms of the index category need not have any internal substance, but rather merely outline the connective structure of at least some part of the diagram's codomain. If the index category is ''J'' and the codomain is ''C'', then the diagram is said to be "of type ''J'' in ''C ".