Skip to main content

Contains terms and definitions used in the reference book, the project and the structure of the Ontology.

Browse the glossary using this index

Special | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | ALL



Measure of the imprecision in the definition of the specific values of a measured variable. It has also been defined as a degree of incompleteness of knowledge about the process under consideration and our inability to define certain aspects of it.


Caring about environment, health, a peaceful world and social justice.

Urban drainage

Includes both man-made and natural elements of an urban environment.

Urban ecosystems

The cities, towns, and urban strips constructed by humans.


The expansion of the urban area in time.

Utility services

Services provided to customers and industry such as gas, electricity, telephone, cable TV and water.