Strong's #1646: elachistos (pronounced el-akh'-is-tos)
 superlative of elachus (short); used as equivalent to 3398; least (in size, amount, dignity, etc.):--least, very little (small), smallest.
Thayer's Greek Lexicon:
 ̓́ 
 
  elachistos 
 
 1) smallest least
 
 1a) in size
 1b) in amount: of management of affairs
 1c) in importance: what is the least moment
 1d) in authority: of commandments
 1e) in the estimation of men: of persons
 1f) in rank and excellence: of persons
 
  Part of Speech: adjective
Relation: superlative of elachus (short); used as equivalent to G3398
  Citing in TDNT: 4:648, 593
 
Usage:
This word is used 13 times:
Matthew 2:6: "of Judah, art not  the least among the princes of Judah:"
Matthew 5:19: "therefore shall break one of these  least commandments, and shall teach"
Matthew 5:19: "shall teach men so, he shall be called  the least in the kingdom"
Matthew 25:40: "Inasmuch as ye have done it unto one of the  least of these my brethren,"
Matthew 25:45: "ye did it not to one of the  least of these, ye did it not"
Luke 12:26: "If ye then be not able  to do that thing which is least, why take ye thought for"
Luke 16:10: "He that is faithful in  that which is least is faithful also in much:"
Luke 16:10: "and he that is unjust in  the least is unjust also in"
Luke 19:17: "thou hast been faithful in  a very little, have thou authority over"
1 Corinthians 4:3: "with me it is a  very small thing that I should be judged of you,"
1 Corinthians 6:2: "you, are ye unworthy  to judge the smallest matters?"
1 Corinthians 15:9: "I am the  least of the apostles, that am"
James 3:4: "winds, yet are they turned about with  a very small helm, whithersoever the"