four hundred
tetrakosioi denotes a quantity of four hundred, used for spans of years and for a body of men.
The term marks a quantity within stated periods of years, including oppression, the interval before the law, and the period associated with judges; it also counts the men who joined Theudas.
Senses in use
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Four hundred in periods of years · dominant
The neuter plural forms occur in time expressions: in Acts 7:6 the APB renders a period in which offspring would be enslaved and mistreated "for four hundred years," while Galatians 3:17 renders the law as coming "four hundred and thirty years later." In Acts 13:20, the dative plural neuter form stands in the clause the APB renders "For about four hundred and fifty years he gave them judges."
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Four hundred men · occasional
In Acts 5:36, the genitive plural masculine form occurs with men who joined Theudas; the APB renders the clause, "about four hundred men joined him."
In the Anselm Project Bible: The APB presents the quantity explicitly in each verse: in periods of years as "four hundred," "four hundred and fifty," and "four hundred and thirty," and in Acts 5:36 with "men." These phrases show the verse-level presentation rather than a precise token-by-token rendering.