Onerosas

Onerosas is the feminine plural form of the adjective oneroso in Spanish. It is used to describe obligations, terms, or conditions that impose burdens or costs on one or more parties. The term originates from Latin onerōsus, related to onus, burden, and is cognate with the English word onerous.

In civil law, contracts can be characterized as onerous when each party receives a benefit in exchange for a burden or consideration. This contrasts with gratuitous contracts, where one party benefits without a corresponding obligation for consideration. The concept also appears in property and commercial contexts, where cargas onerosas (burdens) or gravámenes onerosos (onerous encumbrances) may affect the use, transfer, or enjoyment of property, such as liens, easements, or fees that must be satisfied.

Usage and scope. Onerosas is commonly used in legal texts in Spanish-speaking jurisdictions, including Spain, Latin America, and others, to describe the nature of contracts, obligations, or clauses that entail mutual duties or costs. It can modify nouns like cláusulas, obligaciones, prestaciones, or contratos, with the sense that the obligation is not gratuitous.

Examples. A lease may be described as oneroso if the tenant must pay rent and perform duties; a sale is often onerosa because both sides exchange value. Donaciones (donations) are typically gratuitous, whereas contratas o acuerdos comerciales frequently involve prestaciones onerosas.

See also. Onerosidad, gravamen, gravoso.