A physical phenomenon (such as force, potential or fluid velocity) that pervades a region; a mathematical model of such a phenomenon that associates each point and time with a scalar, vector or tensor quantity.
(φυσ.) η περιοχή εντός της οποίας μία δύναμη επηρεάζει ένα σώμα, π .χ. ηλεκτρικό πεδίο