From BiblePortal Wikipedia

Webster's Dictionary [1]

(1): ( n.) A tenure; a farm or other estate held of another.

(2): ( n.) That which holds, binds, or influences.

(3): ( n.) The burden or chorus of a song.

(4): ( n.) The act or state of sustaining, grasping, or retaining.

(5): ( p. pr. & vb. n.) of Hold

King James Dictionary [2]

Holding ppr. Stopping confining restraining keeping retaining adhering maintaining, &c.

HOLDING, n. A tenure a farm held of a superior.

1. The burden or chorus of a song. 2. Hold influence power over.

International Standard Bible Encyclopedia [3]

hōl´ding  : Occurs with various shades of meaning: (1) as the translation of tāmakh , "to acquire," it has the sense of taking, obtaining ( Isaiah 33:15 , the Revised Version (British and American) "that shaketh his hands from taking a bribe," the English Revised Version, as the King James Version, "holding"); (2) of kūl , "to hold," "contain," having the sense of containing or restraining ( Jeremiah 6:11 , "I am weary with holding in"); (3) of kratéō , "to receive," "observe," "maintain" ( Mark 7:3 , "holding the tradition of the elders";  1 Timothy 1:19 , échō , "holding faith and a good conscience";  1 Timothy 3:9 , "holding the mystery of the faith in a pure conscience"); (4) holding fast, cleaving to, krateō ( Colossians 2:19 , "not holding the head," the Revised Version (British and American) "holding fast"; compare  Acts 3:11;  Revelation 7:1 , "holding the four winds of the earth, that no wind should blow"); antéchomai , "to hold over against one's self," "to hold fast" (Tit 19, the Revised Version (British and American) "holding to the faithful word"); (5) holding forth, epéchō , "to hold upon, to hold out toward" ( Philippians 2:16 , "holding forth the word of life," so the Revised Version (British and American)); Lightfoot has "holding out" (as offering); others, however, render "holding fast," persevering in the Christian faith and life - connecting with being "blameless and harmless" in  Philippians 2:15 .