1. Physics(Abstract Noun)
[a] The ratio of the effective or useful output to the total input in any system.
[b] The ratio of the energy delivered by a machine to the energy supplied for its operation. শক্তি আদিৰ ব্যৱহাৰ যোগ্য ভাগ আৰু মুঠ ভাগৰ অনুপাত৷

English: efficiency,
Assamese: কাৰ্য্যক্ষমতা নৈপুণ্য, দক্ষতা,
Bodo: जग्य,
Mising: jubgo,
Dimasa: blai-yahbah, prang-yahbah,
Deori: লবা

Different POS:

a. Proper Adj.: able, accomplished, adept, adroit, capable...