when, &c. Literally in the day. being completed. The Syriac and Vulgate read "days". This refers to the completion of the seven weeks (fifty days inclusive) from the waving of the sheaf of firstfruits (Leviticus 23:15; Leviticus 23:16).
Pentecost. fiftieth (day). Greek. Pentekostos. Only here; Act 20:16. 1 Corinthians 16:8.
fully come. being fulfilled. Greek. siimpleroo. Only here and Luke 8:23; Luke 9:51.
with one accord. See note on Acts 1:14.
in one place. together. See note on Acts 1:15.