Pleistos (πλεῖστος) is the superlative form of polys (G4183, much/many), meaning most, greatest, or largest in number. It represents the highest degree of quantity or magnitude.
In Matthew 11:20, Jesus begins to denounce the cities where most of His miracles had been performed, because they did not repent. This reveals a sobering principle: greater revelation brings greater responsibility. Those who witness the most miracles and hear the most truth are held to the highest standard of response. In 1 Corinthians 14:27, Paul uses pleistos to set a practical limit — at most three speakers in tongues per service — showing that even spiritual gifts require orderly governance. The word challenges us: with the greatest access to truth comes the greatest accountability.