from
The Free On-line Dictionary of Computing (8 July 2008)
aggregate type
<programming> A data {type} composed of multiple elements. An
aggregate can be homogeneous (all elements have the same type)
e.g. an {array}, a list in a {functional language}, a string
of characters, a file; or it can be heterogeneous (elements
can have different types) e.g. a {structure}. In most
languages aggregates can contain elements which are themselves
aggregates. e.g. a list of lists.
See also {union}.
(1996-03-23)