Strong's #2389: chazaq (pronounced khaw-zawk')
 from 2388; strong (usu. in a bad sense, hard, bold, violent):--harder, hottest, + impudent, loud, mighty, sore, stiff(-hearted), strong(-er).
Brown-Driver-Briggs Hebrew Lexicon:
 
  châzâq 
 
 1) strong, stout, mighty
 
 1a) strong
 
 1a1) severe, sharp, hot
 1a2) firm, hard
 
 1b) a strong one (substantive)
 
  Part of Speech: adjective
Relation: from H2388
Usage:
This word is used 57 times:
Exodus 3:19: "let you go, no,  not by a mighty hand."
Exodus 6:1: "I will do to Pharaoh:  with a strong hand shall he let them go, and with a strong hand"
Exodus 6:1: "with a strong hand shall he let them go,  and with a strong hand shall he drive them out of his land."
Exodus 10:19: "And the LORD turned a mighty  strong west wind, which took away"
Exodus 13:9: "may be in thy mouth: for  with a strong hand hath the LORD brought thee out of Egypt."
Exodus 19:16: "and the voice of the trumpet exceeding  loud; so that all the people that was in the camp"
Exodus 32:11: "out of the land of Egypt with great power,  and with a mighty hand?"
Numbers 13:18: "that dwelleth therein, whether they  be strong or weak, few or many;"
Numbers 13:31: "against the people; they  are stronger than"
Numbers 20:20: "against him with much people,  and with a strong"
Deuteronomy 3:24: "thy servant thy greatness,  and thy mighty hand: for what God"
Deuteronomy 4:34: "by temptations, and by wonders, and by war,  and by a mighty hand, and by a stretched out arm,"
Deuteronomy 5:15: "thy God brought thee out  through a mighty hand and by a stretched out arm:"
Deuteronomy 6:21: "and the LORD brought us out of Egypt  with a mighty hand:"
Deuteronomy 7:8: "which he had sworn unto your fathers, brought you out  with a mighty hand,"
Deuteronomy 7:19: "saw, and the signs, and the wonders,  and the mighty hand, arm, whereby"
Deuteronomy 9:26: "which thou hast brought forth out of Egypt  with a mighty hand."
Deuteronomy 11:2: "his greatness,  his mighty hand, and his stretched out arm,"
Deuteronomy 26:8: "And the LORD brought us forth out of Egypt  with a mighty hand, and with an outstretched arm,"
Deuteronomy 34:12: "And in all  that mighty hand, and in all the great terror which Moses"
Joshua 4:24: "of the LORD, that  is mighty: that ye might fear the LORD"
Joshua 14:11: "As yet  I am as strong this day as I was in the day that Moses sent me: as my strength"
Joshua 17:18: "chariots, and though they  be strong."
Judges 18:26: "saw that they  were too strong him, he turned and went back unto"
1 Samuel 14:52: "And there was  sore war against the Philistines all the days of Saul:"
2 Samuel 11:15: "Uriah in the forefront  of the hottest and retire ye from"
1 Kings 8:42: "thy great name,  and of thy strong hand, and of thy stretched out arm;)"
1 Kings 17:17: "was so  sore, that there was no breath"
1 Kings 18:2: "to show himself unto Ahab.  And there was a sore famine in Samaria."
1 Kings 19:11: "the LORD passed by,  and strong wind rent the mountains, and broke in pieces"
2 Chronicles 6:32: "but is come from a far for thy great name's sake,  and thy mighty"
Nehemiah 1:10: "thou hast redeemed by thy great power,  and by thy strong hand."
Job 5:15: "from the sword, from their mouth, and from the hand  of the mighty."
Job 37:18: "Hast thou with him spread out the sky,  which is strong, and as a molten looking glass?"
Psalms 35:10: "is like unto thee, which deliverest the poor from him that is too strong  from him that is too strong him, yea, the poor and the needy"
Psalms 136:12: " With a strong hand, and with a stretched out arm: for his mercy endureth forever."
Proverbs 23:11: "For their redeemer  is mighty; he shall plead their cause with"
Isaiah 27:1: "the LORD with his sore and great  and strong sword shall punish leviathan"
Isaiah 28:2: "Behold, the Lord  hath a mighty and strong one, which as a tempest of hail and a destroying storm,"
Isaiah 40:10: "the Lord GOD will come  with strong hand, and his arm shall rule for him: behold, his reward"
Jeremiah 21:5: "against you with an outstretched hand  and with a strong arm, even in anger, and in fury,"
Jeremiah 31:11: "Jacob, and ransomed him from the hand  of him that was stronger than"
Jeremiah 32:21: "out of the land of Egypt with signs, and with wonders,  and with a strong hand, and with a stretched out arm,"
Jeremiah 50:34: "Their Redeemer  is strong; the LORD of hosts is his name: he shall throughly plead"
Ezekiel 2:4: "For they are impudent children  and stiffhearted. I do send thee unto"
Ezekiel 3:7: "all the house of Israel  are impudent and hardhearted."
Ezekiel 3:8: "I have made thy face  strong against their faces, and thy forehead"
Ezekiel 3:8: "their faces, and thy forehead  strong against their foreheads."
Ezekiel 3:9: "As an adamant  harder than flint have I made thy forehead: fear them not,"
Ezekiel 3:14: "of my spirit; but the hand of the LORD  was strong upon"