Pen·te·cost /ˈpɛntɪˌkɔst, ˌkɑst/
  猶太人收; 祭
  Pen·te·cost n.
  1. A solemn festival of the Jews; -- so called because celebrated on the fiftieth day (seven weeks) after the second day of the Passover (which fell on the sixteenth of the Jewish month Nisan); -- hence called, also, the Feast of Weeks. At this festival an offering of the first fruits of the harvest was made. By the Jews it was generally regarded as commemorative of the gift of the law on the fiftieth day after the departure from Egypt.
  2. A festival of the Roman Catholic and other churches in commemoration of the descent of the Holy Spirit on the apostles; which occurred on the day of Pentecost; -- called also Whitsunday.
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  Pentecost
       n 1: seventh Sunday after Easter; commemorates the emanation of
            the Holy Spirit to the apostles; a quarter day in
            Scotland [syn: Whitsunday]
       2: (Judaism) Jewish holy day celebrated on the sixth of Sivan
          to celebrate Moses receiving the Ten Commandments [syn: Shavous,
           Shabuoth, Shavuoth, Shavuot, Feast of Weeks]
  Pentecost
     i.e., "fiftieth", found only in the New Testament (Acts 2:1;
     20:16; 1 Cor. 16:8). The festival so named is first spoken of in
     Ex. 23:16 as "the feast of harvest," and again in Ex. 34:22 as
     "the day of the firstfruits" (Num. 28:26). From the sixteenth of
     the month of Nisan (the second day of the Passover), seven
     complete weeks, i.e., forty-nine days, were to be reckoned, and
     this feast was held on the fiftieth day. The manner in which it
     was to be kept is described in Lev. 23:15-19; Num. 28:27-29.
     Besides the sacrifices prescribed for the occasion, every one
     was to bring to the Lord his "tribute of a free-will offering"
     (Deut. 16:9-11). The purpose of this feast was to commemorate
     the completion of the grain harvest. Its distinguishing feature
     was the offering of "two leavened loaves" made from the new corn
     of the completed harvest, which, with two lambs, were waved
     before the Lord as a thank offering.
       The day of Pentecost is noted in the Christian Church as the
     day on which the Spirit descended upon the apostles, and on
     which, under Peter's preaching, so many thousands were converted
     in Jerusalem (Acts 2).