The column of a table is referred to as the

Concept. The relational model describes data as a relation, visualised as a two-dimensional table. Its structure has fixed names: each named vertical field of the table is an attribute, and each horizontal record is a tuple.

Applying it here. A "column of a table" is exactly the vertical field that holds all values of one named property (for example a Name column or an Age column). In relational terminology that vertical field is the attribute, so "attribute" is the term asked for.

Contrasting the other terms:

• "tuple" — a tuple is a single row (one complete record) of the table, the horizontal counterpart of a column, not the column itself.

• "entity" — an entity is a real-world object or concept that the whole relation models; it is an ER-modelling notion, not the name of one vertical field.

• "degree" — degree is a count: the number of attributes (columns) in a relation. It is a property of the table, not the name of an individual column.

Cross-check. Pairing the dimensions confirms it: row = tuple and column = attribute; the number of columns is the degree and the number of rows is the cardinality. The single named vertical field therefore maps to "attribute".