From Ancient Greek μέγας (mégas, “great, large, mighty”), from Proto-Indo-European *méǵh₂s (“great”). Cognate with Latin magnus, and with Germanic words: Gothic 𐌼𐌹𐌺𐌹𐌻𐍃 (mikils), Old English micel, Middle English muchel, English much, Old High German mihhil, Old Norse mikill, Danish meget.
మెగా- • (megā-)
- Very large, great.
- In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by one million (106.) SI Symbol: M, computing abbreviation: Mi.