Absolute reference
Galilean reference frame (without acceleration).
Admittance
The ocean's response, depending on the frequency, to the action of the generating force.
Age of the tide
Time interval between the syzygy and the maximum range of tide that follows.
Altimetry
Measurement of the height of water using spatial techniques.
Amphidromic points
Points located at sea around which the tide wave appears to turn.
Amplitude
Difference between the height of a high or low tide and the mean level. This term is often used in error to designate the range of tide.
Apparent time
True solar hour angle.
Argument number
Method for designating the components of the tide, using a 6-figure number, making it possible to identify the astronomical parameters from which they are derived and deduce from them their period.
Ascending node
Point at which the lunar orbit and the ecliptic intersect in the direction of movement of the Moon from the Southern to the Northern hemisphere.
Backrush current
Current generated by the slope of the free surface, excluding the action of the tide.
CCI
Chamber of Commerce and Industry.
CEA/LDG
Commissariat à l'Energie Atomique et aux Energies Alternatives / Laboratoire de Détection et de Géophysique (Atomic energy and alternative energy commission / Detection and geophysical laboratory).
CENALT
Centre national d'alerte aux tsunamis (national tsunami alert centre)
CETE
Centre d'études techniques de l'équipement (equipment technical study centre).
CETMEF
Centre d'Etudes Techniques Maritimes Et Fluviales (maritime and fluvial technical study centre).
CG
Conseil Géneral (county council).
CGC
Commission de gestion de configuration (configuration management committee).
CGEDD
Conseil général de l'environnement et du développement durable (general council for the environment and sustainable development).
Chart datum
Same as hydrographic datum.
CIL
Correspondant Informatique et Libertés (data protection coordinator).