Strong's #630: apoluo (pronounced ap-ol-oo'-o)
 from 575 and 3089; to free fully, i.e. (literally) relieve, release, dismiss (reflexively, depart), or (figuratively) let die, pardon or (specially) divorce:--(let) depart, dismiss, divorce, forgive, let go, loose, put (send) away, release, set at liberty.
Thayer's Greek Lexicon:
 ̓́ 
 
  apoluō 
 
 1) to set free
 2) to let go, dismiss, (to detain no longer)
 
 2a) a petitioner to whom liberty to depart is given by a decisive answer
 2b) to bid depart, send away
 
 3) to let go free, release
 
 3a) a captive, i.e. to loose his bonds and bid him depart, to give him liberty to depart
 3b) to acquit one accused of a crime and set him at liberty
 3c) indulgently to grant a prisoner leave to depart
 3d) to release a debtor, i.e. not to press one' s claim against him, to remit his debt
 
 4) used of divorce, to dismiss from the house, to repudiate. The wife of a Greek or Roman may divorce her husband.
 5) to send one' s self away, to depart
 
  Part of Speech: verb
Relation: from G575 and G3089
 
Usage:
This word is used 70 times:
John 19:10: "and have power  to release thee?"
John 19:10: "and have power  to release thee?"
John 19:12: "thenceforth Pilate sought  to release him: but the Jews"
John 19:12: "cried out, saying, If  thou let this man go, thou art not Caesar's"
Acts 3:13: "in the presence of Pilate, when he was determined  to let him go."
Acts 4:21: "So when they had further threatened  them, they let them go, finding nothing how"
Acts 4:23: "And  being let go, they went to their own company, and reported all that"
Acts 5:40: "name of Jesus, and  let them go."
Acts 13:3: "laid their hands on them,  they sent them away."
Acts 15:30: "So when they were  dismissed, they came to Antioch: and"
Acts 15:33: "And after they had tarried there a space,  they were let go in peace from the"
Acts 16:35: "the sergeants, saying,  Let those men go."
Acts 16:36: "magistrates have sent to  let you go: now therefore depart, and go"
Acts 17:9: "and of the other,  they let them go."
Acts 19:41: "And when he had thus spoken,  he dismissed the assembly."
Acts 23:22: "the chief captain then  let the young man depart, and charged him, See thou tell"
Acts 26:32: "This man might  have been set at liberty, if he had not appealed unto Caesar."
Acts 28:18: "when they had examined me, would  have let me go, because there was no cause of death"
Acts 28:25: "when they agreed not among themselves,  they departed, after that Paul had spoken one"
Hebrews 13:23: "Know ye that our brother Timothy  is set at liberty; with whom, if he come"