| Subject | English | Maltese |
| transp., mil., grnd.forc., el. | complex electronic vehicle control system | sistema kumplessa ta' kontroll elettroniku tal-vettura |
| environ. | complex formation Formation of a complex compound. Also known as complexing or complexation | formazzjoni komplessa |
| comp., MS | complex number | numru kumpless (A number in the form a + bi, where a and b are real numbers and i = sqrt(-1) , so that bi is imaginary unless b = 0) |
| comp., MS | complex script | skript kumpless (A language whose characters require ligation or shaping, such as a right-to-left language (Arabic, Persian, Hebrew, and Urdu) or certain South Asian languages) |
| chem. | complex substance | sustanza kumplessa |
| environ. | complexing agent A substance capable of forming a complex compound with another material in solution | aġent komplessanti |
| industr. | military-industrial complex | Kumpless Militari Industrijali |
| chem. | substance of unknown or variable composition, complex reaction products or biological materials | sustanza ta' kompożizzjoni mhux magħrufa jew varjabbli, prodotti kumplessi ta' reazzjoni jew materjali bijoloġiċi |
| health., med. | tuberous sclerosis complex | sklerożi tuberuża |