From BiblePortal Wikipedia

Vine's Expository Dictionary of NT Words [1]

1: Ἀθῶος (Strong'S #121 — Adjective — athoos — ath'-o-os )

primarily denotes "unpunished" (a, negative, thoe, "a penalty"); then, "innocent,"  Matthew 27:4 , "innocent blood," i.e., the blood of an "innocent" person, the word "blood" being used both by synecdoche (a part standing for the whole), and by metonymy (one thing standing for another), i.e., for death by execution (some mss. have dikaion, "righteous");  Matthew 27:24 , where Pilate speaks of himself as "innocent."

2: Ἄκακος (Strong'S #172 — Adjective — akakos — ak'-ak-os )

lit., "not bad" (a, negative, kakos, "bad"), denotes "guileless, innocent,"  Romans 16:18 , RV, "innocent" (AV, "simple"); "harmless" in  Hebrews 7:26 . See Harmless.

Webster's Dictionary [2]

(1): ( a.) Not harmful; free from that which can injure; innoxious; innocuous; harmless; as, an innocent medicine or remedy.

(2): ( a.) Free from the guilt of a particular crime or offense; as, a man is innocent of the crime charged.

(3): ( a.) Simple; artless; foolish.

(4): ( a.) Lawful; permitted; as, an innocent trade.

(5): ( a.) Not contraband; not subject to forfeiture; as, innocent goods carried to a belligerent nation.

(6): ( n.) An innocent person; one free from, or unacquainted with, guilt or sin.

(7): ( n.) An unsophisticated person; hence, a child; a simpleton; an idiot.

(8): ( a.) Morally free from guilt; guiltless; not tainted with sin; pure; upright.

King James Dictionary [3]

IN'NOCENT, a. L.innocens.

1. Properly, not noxious not producing injury free from qualities that can injure harmless innoxious as an innocent medicine or remedy. 2. Free from guilt not having done wrong or violated any law not tainted with sin pure upright. In this general sense, no human being that is a moral agent, can be innocent. It is followed by of. 3. Free from the guilt of a particular crime or evil action as, a man is innocent of the crime charged in the indictment. 4. Lawful permitted as an innocent trade. 5. Not contraband not subject to forfeiture as innocent goods carried to a belligerent nation.

IN'NOCENT, n. One free from guilt or harm.

1. A natural an idiot. Unusual.

Morrish Bible Dictionary [4]

A word often used in the O.T. in opposition to those manifesting wickedness. It occurs only twice in the N.T.: as uttered by Judas in reference to the Lord, to whom it could be truthfully applied as 'guiltless;' and by Pilate in reference to himself.  Matthew 27:4,24 . It was the true state of Adam and Eve before they fell. See Holiness

Cyclopedia of Biblical, Theological and Ecclesiastical Literature [5]

(prop. נָקַי , Άθῶος ). The Hebrews considered innocence as consisting chiefly in an exemption from external faults committed contrary to the law hence they often join innocent with hands ( Genesis 37:22;  Psalms 24:4). "I will wash my hands in innocency" ( Psalms 26:6).; "Then have I cleansed my heart in vain, and washed my hands in innocency" ( Psalms 73:13). Josephus admits of no other sins than those actions which are put in execution (Ant. 12:7, 1). Sins in thought, in his account, are not punished by God. This is a very different standard of morality from that of the Gospel ( Matthew 5:28;  John 3:15), or even of the O.T. ( Psalms 51:6). To be innocent is used sometimes for being exempt from punishment. "I will not treat you, as one innocent" ( Jeremiah 46:28); literally, I will not make thee innocent; I will chastise thee, but like a kind father. Jeremiah ( Jeremiah 49:12), speaking to the Edomites, says, "They who have not (so much) deserved to drink of the cup of my wrath, have tasted of it."  Nahum 1:3 declares that "God is ready to exercise vengeance; he will make no one innocent; he will spare no one;" ( Exodus 34:7, Heb.), "Thou shalt make no one innocent;" no sin shall remain unpunished. "With the pure thou wilt show thyself pure" ( Psalms 18:26); thou treatest the just as just, the good as good; thou never dost confound the guilty with the innocent.

The Nuttall Encyclopedia [6]

The name of 13Popes:

ope from 402 to 417;

ope from 1130 to 1143;

ope from 1198 to 1216;

ope from 1243 to 1254;

ope in 1276;

ope from 1352 to 1362, resided at Avignon;

ope from 1404 to 1406;

ope from 1484 to 1492;

ope in 1591;

ope from 1644 to 1655, condemned Jansenism;

ope from 1676 to 1689;

ope from 1691 to 1700;

ope from 1721 to 1724; of these there were two of note.