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| Subject | English | Catalan |
| math. | high contact | contacte d'ordre superior |
| cinema | high-definition | alta definició |
| cinema | high fidelity | Hi-Fi |
| cinema | high fidelity | alta fidelitat |
| comp., MS | high importance | importància alta (A flag that can be set for Lync and Communicator calls or instant messages to indicate the urgency of the conversation) |
| load.equip. | high lift pallet truck | portapalets de gran elevació |
| load.equip. | high-lift pallet truck | portapalets de gran elevació |
| math. | high-low graph | gràfic de màxims i mínims |
| environ. | high mountain | alta muntanya |
| environ. | high protein food | aliment alt en proteïnes |
| cinema | high-res | alta definició |
| cinema | high-resolution | alta definició |
| environ. | high-rise building Any tall, multistoried structure or edifice that is equipped with elevators | edifici de gran alçada |
| cinema | high-speed camera | càmera d’alta velocitat |
| environ. | high-speed railway The term "high-speed traffic" encompasses all trains running at speeds over 200 km/h but also trains running at 200 km/h if the terrain, population density or economic reasons do not justify higher speeds | ferrocarril d'alta velocitat |
| environ. | high-speed train Trains travelling at maximum speeds of 300kmh on special high-speed rail lines | trens d'alta velocitat |
| environ. | high tide water The level of water when the tide is at its highest level | plenamar |
| comp., MS | high-trust app | aplicació d'alta confiança (An app that uses the server-to-server (S2S) protocol, where the app is responsible for creating the user portion of the access token, and therefore is trusted to assert any user identity) |
| environ. | high voltage line An electric line with a voltage on the order of thousands of volts | línia d'alta tensió |
| environ. | higher education Study beyond secondary school at an institution that offers programs terminating in undergraduate and graduate degrees | ensenyament superior |
| math. | highest posteriori density interval | interval de densitat a posteriori maximal |