Extricate
you are right. According to ICAO Flight Planning document:
Fundamentally, contingency fuel is the fuel required to compensate for factors that could not be foreseen during flight planning. Such factors include, but are not necessarily limited to deviations from flight plan that could influence the total fuel consumed en-route to the destination such as:
deviations of an individual aeroplane from the expected fuel consumption data;
unforeseen meteorological conditions;
unexpected taxi times before take-off;
unplanned or unanticipated routings and/or cruising levels.