Strong's #4413: protos (pronounced pro'-tos)
 contracted superlative of 4253; foremost (in time, place, order or importance):--before, beginning, best, chief(-est), first (of all), former.
Thayer's Greek Lexicon:
 ͂ 
 
  prōtos 
 
 1) first in time or place
 
 1a) in any succession of things or persons
 
 2) first in rank
 
 2a) influence, honour
 2b) chief
 2c) principal
 
 3) first, at the first
 
  Part of Speech: adjective
Relation: contracted superlative of G4253
  Citing in TDNT: 6:865, 965
 
Usage:
This word is used 100 times:
Matthew 10:2: "apostles are these;  The first, Simon, who is called Peter, and"
Matthew 12:45: "is worse than the  first. Even so shall it be also unto this"
Matthew 17:27: "and take up the fish  that first cometh up; and when thou hast opened his"
Matthew 19:30: "But many  that are first shall be last; and the last shall be first."
Matthew 19:30: "last; and the last  shall be first."
Matthew 20:8: "last unto the  first."
Matthew 20:10: "But when the  first came, they supposed that they should have received more;"
Matthew 20:16: "the last shall be  first, and the first last:"
Matthew 20:16: "first, and the  first last: for many be"
Matthew 20:27: "whosoever will be  chief among you, let him be"
Matthew 21:28: "and he came to the  first, and said, Son, go work"
Matthew 21:31: "say unto him, The  first. Jesus saith unto them, Verily"
Matthew 21:36: "servants more than the  first: and they did unto them likewise."
Matthew 22:25: "brethren: and the  first, when he had married a wife, deceased, and, having"
Matthew 22:38: "This is  the first and great commandment."
Matthew 26:17: "Now the  first day of the feast of unleavened bread the disciples came"
Matthew 27:64: "error shall be worse than the  first."
Mark 6:21: "high captains, and  chief estates of Galilee;"
Mark 9:35: "If any man desire to be  first, the same shall be last of all, and"
Mark 10:31: "But many  that are first shall be last; and the last"
Mark 10:31: "and the last  first."
Mark 10:44: "whosoever of you will be  the chiefest shall be servant of all."
Mark 12:20: "brethren: and the  first took a wife, and dying"
Mark 12:28: "him, Which is  the first commandment of all?"
Mark 12:29: "Jesus answered him,  The first of all the commandments is, Hear,"
Mark 12:30: "thy strength: this  is the first commandment."
Mark 14:12: "And the  first day of unleavened bread, when they killed the"
Mark 16:9: "Now when Jesus was risen early  the first day of the week, he appeared first to Mary"
Luke 2:2: "(And this taxing  was first made when Cyrenius was governor of Syria.)"
Luke 11:26: "is worse than the  first."
Luke 13:30: "last which shall be  first, and there are first which"
Luke 13:30: "first, and there are  first which shall be last."
Luke 14:18: "consent began to make excuse. The  first said unto him, I have bought a piece of ground,"
Luke 15:22: "servants, Bring forth the  best robe, and put it on him;"
Luke 16:5: "debtors unto him, and said unto the  first, how much owest thou unto my lord?"
Luke 19:16: "Then came the  first, saying, Lord, thy pound"
Luke 19:47: "and the scribes and the  chief of the people"
Luke 20:29: "brethren: and the  first took a wife, and died without children."
John 1:15: "me: for he was  before me."
John 1:30: "me: for he was  before me."
John 1:41: "He  first findeth his own brother Simon, and saith"
John 5:4: "troubled the water: whosoever then  first after the troubling"
John 8:7: "them, He that is without sin among you,  let him first cast a stone at her."
John 19:32: "the legs of the  first, and of the other which was crucified with"
John 20:4: "did outrun Peter and came  first to the sepulcher."
John 20:8: "other disciple, which came  first to the sepulcher, and"
Acts 1:1: "The  former treatise have I made, O Theophilus, of"
Acts 12:10: "When they were past  the first and the second ward, they came unto"
Acts 13:50: "women, and the  chief men of the city, and raised"
Acts 16:12: "Philippi, which is  the chief city of that part of Macedonia, and a colony:"