imperfection / incompleteness / defectiveness

(meteorology) warm front

(grammar) prepositional case

(attributive, computing, typography, of an East Asian character or glyph) the state of being fullwidth and full-height which, in early computer encoding, occupies 2 bytes, and in modern typography, equals 1 em

prerequisite

certainty, inevitability, necessity

the front, the part in front / façade

nature, specifically its personification Mother Nature

perfect, flawless

perfection