a Latin phrase (or its abbreviation) used to indicate that special attention should be paid to something; "the margins of his book were generously supplied with pencilled NBs"
a soft gray ductile metallic element used in alloys; occurs in niobite; formerly called columbium
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plead means
appeal or request earnestly; "I pleaded with him to stop"; enter a plea, as in courts of law; "She pleaded not guilty"; offer as an excuse or plea; "She wa... more
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