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