Meaning

noun the cardinal number that is the fifth power of ten

originBorrowed from Hindustani लाख or لاکھ (lākh), from Sanskrit लक्ष (lakṣa), from लक्ष् (lakṣ, “to mark; to sign; to observe, perceive”), possibly from रक्ष् (rakṣ, “to observe (a duty, law, etc.); to guard, protect”), ultimately from Proto-Indo-European *h₂lek- (“to protect”).

Etymology from Wiktionary, CC BY-SA 3.0