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Related to requirable: requires
tr.v. re·quired, re·quir·ing, re·quires
1. To have as a requisite or necessity; need or depend on: Do you require assistance? Most plants require plenty of water.
a. To stipulate as obligatory by authority: The law requires full disclosure of charitable donations.
b. To demand as obligatory or appropriate: Skiing requires practice.
3. To impose an obligation on; compel: The school requires all students to study mathematics.
[Middle English requiren, from Old French requerre, from Vulgar Latin *requaerere, alteration (influenced by quaerere, to seek) of Latin requīrere : re-, re- + quaerere, to seek.]