Attraction
Hegel (Logic of Being, moment of being-for-itself)
Attraction is the relation of the many ones to one another --- attraction. After repulsion (repelling), attraction arises: the ones seek unity. It is the negation of repulsion, but presupposes it. Example: physical attraction (gravity), but also logically: the many strive toward unity. Attraction and repulsion are inseparable: only what has been repelled can be attracted. Their unity leads to quantity (the many indifferent ones).
Origin
Lat. attractio. Newton: gravitational attraction. Kant in Metaphysical Foundations of Natural Science: attraction and repulsion constitute matter. Hegel criticizes Kant's physical construction and turns them into logical categories of being-for-itself.
In Hegel
Enc. §98; SL Vol. 1, Quality