"joy, delight" (akin to A, No. 1 above), is rendered "gladness" in the AV of Mark 4:16; Acts 12:14; Philippians 2:29 (RV "joy," as elsewhere in both versions). See JOY.

2: ἀγαλλίασις

(Strong's #20 — Noun Feminine — agalliasis — ag-al-lee'-as-is )

"exultation, exuberant joy" (akin to A, No. 2), is translated "gladness" in Luke 1:14; Acts 2:6; Hebrews 1:9; "joy" in Luke 1:44; "exceeding joy" in Jude 1:24 . It indicates a more exultant "joy" than No. 1. In the Sept. this word is found chiefly in the Psalms, where it denotes "joy" in God's redemptive work, e.g., Psalm 30:5; 42:4; 45:7,15 . See JOY.

3: εὐφροσύνη

(Strong's #2167 — Noun Feminine — euphrosune — yoo-fros-oo'-nay )

"good cheer, joy, mirth, gladness of heart" (akin to A, No. 3), from eu, "well," and phren, "the mind," is rendered "gladness" in Acts 2:28 , RV (AV, "joy") and Acts 14:17 . See JOY.

Bibliography Information
Vines, W. E., M. A. Entry for 'Gladness'. Vine's Expository Dictionary of NT Words. https://www.studylight.org/dictionaries/eng/ved/g/gladness.html. 1940.

Bible Dictionaries Gladness

Vine's Expository Dictionary of NT Words

Bible Dictionaries
Gladness