Princeton's WordNet

1. chiefly, principally, primarily, mainly, in the main(adverb)

   for the most part

   "he is mainly interested in butterflies"

Kernerman English Learner's Dictionary

1. mainly(adverb)ˈmeɪn li

   indicates what is most important or significant

   He seemed mainly concerned about his salary.; I mainly use my cell phone for texting.

Wiktionary

1. mainly(Adverb)

   Forcefully, vigorously.

2. mainly(Adverb)

   Of the production of a sound: loudly, powerfully.

3. mainly(Adverb)

   To a great degree; very much.

4. mainly(Adverb)

   Chiefly; for the most part.

Webster Dictionary

1. Mainly(adverb)

   very strongly; mightily; to a great degree

2. Mainly(adverb)

   principally; chiefly

• hoofsaaklikAfrikaans
• بِصورَةٍ رَئيسيَّهArabic
• предимноBulgarian
• principalmentePortuguese (BR)
• převážněCzech
• hauptsächlichGerman
• mest; overvejendeDanish
• κυρίως, κατεξοχήνGreek
• principalmente, sobre todo, en su mayoríaSpanish
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• pääasiassaFinnish
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• terutamaIndonesian
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• terutamaMalay
• voornamelijkDutch
• hovedsakelig, først og fremst, overveiendeNorwegian
• główniePolish
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• اساسى،مهمPashto
• principalmentePortuguese
• în special, în cea mai mare parteRomanian
• в основном; главным образомRussian
• prevažneSlovak
• v glavnemSlovenian
• uglavnomSerbian
• huvudsakligen, mest, till största delenSwedish
• โดยส่วนใหญ่Thai
• başlıca, daha çokTurkish
• 主要地Chinese (Trad.)
• головним чином; здебільшогоUkrainian
• خاص طور سےUrdu
• chủ yếu; phần lớnVietnamese
• 主要地Chinese (Simp.)