This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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A Latin preposition, meaning ‘according to,’ ‘by rule or practice of’: used in some phrases which occur in English books.

Artificially; not naturally.

Artistically; skilfully; scientifically; professionally: used especially as a direction to an apothecary for compounding a prescription.

"Second, that which the praetor promises to all duly instituted heirs, and which is for that reason called secundum tabulas."

secundum quid    secundum artem    secundum naturam    secundum veritatem   

naturam    formam    igitur    quidem    substantia    Sui    suam    essent    eam    hanc