Full Idea
A 'field' is defined in terms of the magnitude of some physical property distributed over every point in time and space.
Gist of Idea
A 'field' is a property with a magnitude, distributed across all of space and time
Source
Jim Baggott (Farewell to Reality: fairytale physics [2013], 2 'Quantum')
Book Reference
Baggott,Jim: 'Farewell to Reality: fairytale physics' [Constable 2013], p.60
A Reaction
If it involves a 'property', normal usage entails that there is some entity which possesses the property. So what's the entity? Eh? Eh? You don't know! Disappointed...