ao invés de

Preposition

 * 1)  contrarily, conversely; in the opposite sense
 * 2)  instead of; in lieu of; in place of; rather than
 * 1)  instead of; in lieu of; in place of; rather than

Usage notes
Literally it bears a sense of opposition, but in informal usage it has been conflated with the similar sounding. This second sense should be avoided in contexts where formality or clarity is expected.