A car that has top that can be folded or removed.

Dutch: cabrio, cabriolet
Polish: kabrio, kabriolet

A corporate security (usually bonds or preferred stock) that can be exchanged for another form of security (usually common stock).

synonym: convertible security.

A sofa that can be converted into a bed.

synonym: sofa bed.

Polish: wersalka

Capable of being exchanged for or replaced by something of equal value:
— Convertible securities.

synonym: exchangeable.

Roget 27: equal, even, level, monotonous, coequal, symmetrical, coordinate; on a par with, on a level with, on a footing with; up to the mark; equiparant^†.    equivalent, tantamount; indistinguishable; quits; homologous; synonymous etc. 522; resolvable into, convertible, much at one, as broad as long, neither more nor less.   ; much the same as, the same thing as, as good as; all one, all the same; equipollent, equiponderant^†, equiponderous^†, equibalanced^†; equalized etc. v.; drawn; half and half; isochronal, isochronous isoperimetric^†, isoperimetrical^†; isobath [Ocean.], isobathic [Ocean.].    ... show more

Roget 144: converted into etc. v.; convertible, resolvable into; transitional; naturalized.   

Designed to be changed from one use or form to another.

Polish: konwertowalny

Capable of being changed in substance as if by alchemy.

synonyms: transformable, translatable, transmutable.