Main

main adjective [ always before noun ] uk/meɪn/ us
B1 most important or largest

основной, главный
the main problem/reason The main airport is 15 miles from the capital. the main thing
B2 the most important fact in a situation

главное
You're happy and that's the main thing.

MAIN noun

[ C ] uk/meɪn/ us  gas/water main
a pipe that carries gas or water to a building

газопроводная/водопроводная труба

 in the main
generally or mostly

в основном
Her friends are teachers in the main .