Task: Pos Tagging
Input (English): Sentence: When combined with the metaphysical notion that pure forms of this universe are best appreciated when least embodied in a material substratum , it becomes clear that while earth will be dross on a scale of material-formal ratios , celestial bodies will be of {{ a }} subtle , quickened , ethereal existence , in whose embodiment pure form will be the dominant component and matter will be absent or remain subsidiary . 
Word: a
Output (English): DET