2. Chance of something happening, whether defined, measured or estimated objectively or subjectively, or in terms of general descriptors (such as rare, unlikely, likely, almost certain), frequencies or mathematical probabilities.

(Source: British Standard BS25999-1:2006 Code of Practice for Business Continuity Management)

3. Used as a general description of probability or frequency of an event occurring.

(Source: Australia. A Practitioner's Guide to Business Continuity Management HB292 - 2006 )

4. Chance of something happening.

NOTE: This Standard uses the word ‘likelihood’ to refer to the chance of something happening, whether defined, measured or determined objectively or subjectively, and described using general terms or mathematically (such as a probability or a frequency over a given time period).

(Source: AS/NZS 5050.1 Australian and New Zealand Standards for business continuity management.

Part 1: Business continuity management system specification)