By a near ${lambda}$-lattice is meant an upper ${lambda}$-semilattice where is defined a parti binary operation $x{Lambda}y$ with respect to the induced order whenever $x$, $y$ has a common lower bound. Alternatively, a near ${lambda}$-lattice can be described as an algebra with one ternary operation satisfying nine simple conditions. Hence, the class of near ${lambda}$-lattices is a quasivariety. A ${lambda}$-semilattice $mathcal{A}=(A;{vee})$ is said to have sectional (antitone) involutions if for each $a{in}A$ there exists an (antitone) involution on [$a$, 1], where 1 is the greatest element of $mathcal{A}$. If this antitone involution is a complementation, $mathcal{A}$ is called an ortho ${lambda}$-semilattice. We characterize these near ${lambda}$-lattices by certain identities.