"principia" meaning in English

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  "etymology_text": "From Latin prīncipia.",
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          "text": "1776, Thomas Pownall, in a letter to the economist Adam Smith\nI do really think, that your book […] might become an institute, containing the principia of those laws of motion, by which the system of the human community is framed and doth act […]"
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          "text": "They were her principia, her rudiments; the elementary atoms; the little steps by which she pressed forward to perfection.",
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        "first principles; elementary material"
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        "(archaic) first principles; elementary material"
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  "word": "principia"
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        "first principles; elementary material"
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