(dated) A sandwich with a mixed filling, such as ham and cheese.

(philosophy) A problem arising from the tension between the seemingly irreducible nature of consciousness, and its ubiquity. If consciousness is ubiquitous, and every atom (or every bit, depending on the theory) has a minimal level of it, then it is not clear how these tiny consciousnesses combine to create larger experiences.

plural of combination problem

(US, UK) A type of pliers used by linemen, electricians, and other tradesmen primarily for gripping, twisting, bending and cutting wire, cable and small metalwork components.

(music) The psychoacoustic phenomenon of an additional tone or tones being perceived when two real tones are sounded at the same time.

plural of combination tone

plural of combinational circuit

plural of combination car

plural of convex combination

(physics) The observation that the sums and differences of the frequencies of spectral lines often equal other observed frequencies; a consequence of quantum mechanics.