Approvable

ap·prove  (-prv)

v. ap·proved, ap·prov·ing, ap·proves

v.tr.

1. To consider right or good; think or speak favorably of.

2. To consent to officially or formally; confirm or sanction: The Senate approved the treaty.

3. Obsolete To prove or attest.

v.intr.

To show, feel, or express approval: didn't approve of the decision.

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[Middle English approven, from Old French aprover, from Latin approbre : ad-, ad- + probre, to test (from probus, good; see per¹ in Indo-European roots).]

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ap·prova·ble adj.

ap·proving·ly adv.

Synonyms: approve, endorse, sanction, certify, accredit, ratify
These verbs mean to express a favorable opinion or to signify satisfaction or acceptance. Approve means to consider right or good, but it can also denote official consent: "The colonel or commanding officer approves the sentence of a regimental court-martial" (Charles James).
Endorse implies the public expression of support: The senator endorsed the candidate by issuing a press release.
Sanction usually implies official authorization: The privilege of voting is a right sanctioned by law.
Certify and accredit imply official approval based on compliance with requirements or standards: "The proper officers, comparing every article with its voucher, certified them to be right" (Benjamin Franklin). The board of education will accredit only institutions that have a sufficiently rigorous curriculum.
To ratify is to invest officially with legal authority: "Amendments . . . shall be valid . . . when ratified by the Legislatures of three fourths of the several States" (U.S. Constitution, Article V).