Strong's Concordance

Original word: νομίμως
Transliteration: nomimós
Definition (short): lawfully
Definition (full): rightly, lawfully

NAS Exhaustive Concordance

Word Origin: from nomimos (conformable to law)
Definition: rightly, lawfully
NASB Translation: lawfully (1), rules (1).
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Strong's Exhaustive Concordance

Adverb from a derivative of nomos; legitimately (specially, agreeably to the rules of the lists) -- lawfully.

see GREEK nomos

KJV: But we know that the law is good, if a man use it lawfully;
NASB: But we know that the Law is good, if one uses it lawfully,
KJV: And if a man also strive for masteries, yet is he not crowned, except he strive lawfully.
NASB: Also if anyone competes as an athlete, he does not win the prize unless he competes according to the rules.