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Soldier from WikiPedia:

A soldier is a member of the land component of national armed forces; whereas a soldier hired for service in a foreign army would be termed a mercenary. In most languages, "soldier" includes commissioned and non-commissioned officers in national land forces.

The word soldier is derived from an Old French word, itself a derivation of Solidarius, Latin for someone who served in the armed forces for pay, as opposed to warriors in tribal society where every grown man is automatically a member of his clan's fighting force. Solidare in Latin means "to pay"; Roman soldiers were paid in solidi, so-called because they were a new type of solid silver coin brought in after a reform of the Roman monetary system.

The common Roman's origin for the words soldier and payment survives not only in French as soldat and solde, but also in other languages, like German Soldat and Sold, Spanish soldado and sueldo, Portuguese soldado and soldo, Dutch soldaat and soldij, Italian "soldato" and "soldo", Arabic "????" (Jondi), or "?????" (mojannad), or "????" (askar) in the Lebanese Dialect, Turkish asker.

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