a natural number

nature / spontaneity

natural selection

right before one's eyes / after a bit of time / right before one's eyes / a prospect for the quite near future / an idea which one is thinking right there, right at the time

Argentina (a country in South America)

incomplete / defective, imperfect

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