Definitions
1.AdjectiveStrikingly appropriate or relevant; well suited to the circumstance or in relation to something.
2.AdjectivePositioned at rest in respect to another, be it side-to-side, front-to-front, back-to-back, or even three-dimensionally: in apposition.
3.AdjectiveRelated, homologous.
4.NounThat which is apposite; something suitable.