Sentence:  This and other fears of the solar system have disappeared gradually , first , with the Ptolemaic system and its built-in concept of periodicity and then , more firmly , with the <WSD>Newtonian</WSD> innovation of an universal force that could account quantitatively for both terrestrial and celestial motions . 
Meaning of the word marked with <WSD> tags:  of or relating to or inspired by Sir Isaac Newton or his science