From BiblePortal Wikipedia

Fausset's Bible Dictionary [1]

The abrupt rocky hills of Palestine admit of but few sweeps of valley between. There are valleys at Hebron, and S.E. of Gerizim, and between Gerizim and Ebal, and between Gilboa and Little Hermon the undulating and English like valley of Jezreel. Five Hebrew terms are so translated. Emequ, always rendered "valley," a long broad sweep between parallel ranges of hills, such as the valley of Jezreel. Gay or gee' , the deep hollow S.W. and S. of Jerusalem, Ge-Hinnom; implying an abrupt, steep, narrow ravine, from a root to burst, a gorge formed by a burst of water.

Νachal , a wady or wide stream bed in winter filled by a torrent, but in summer dry and strewed with water worn stones and shrubs; KJV translated it also "brook," "river," "stream"; Βiqu'ah , a plain wider than a valley, the wide plain between Lebanon and Anti-Lebanon is still called Bequa'a ( Joshua 11:17;  Joshua 12:7), and Megiddo ( Zechariah 12:11). Ηa-shephelah , wrongly translated "valley," a broad tract of low hills between the mountains of Judah and the coast plain ( Deuteronomy 1:7;  Joshua 10:40). The 'eemeq , "valley," of Elah in which Israel and the Philistines pitched is distinguished from the (gay "ravine" which lay between the armies ( 1 Samuel 17:2-3). Shaveh in  Genesis 14:5 is a dale or level spot. "Bottom," metsullah ( Zechariah 1:8), is a dell or shady bottom.

The use of the words 'eemeq and gay assists in the identification of Ai with Khirbet Haiy, one mile E. of Mukhmas (Michmash), which the survey of the Palestine Exploration Fund favors. If Sennacherib invaded Judaea from the E. as did Joshua, he would naturally come to Khirbet Haiy. Thus all the places enumerated in his approach to Jerusalem ( Isaiah 10:28-32) are visible from Geba exactly in the geographical order given in Isaiah, "Aiath, Migron (i.e. 'the precipice'), Michmash." Khirbet Haiy also suits  Joshua 8:11-13, "the Israelites pitched on the N: side of Ai; now there was a valley (Gay ) between them and Ai ... Joshua went that night into the midst of the valley" (emek ). The "plain" N. of Khirbet Haiy suits the Hebrew creek. The gai is either the ravine between the liers in wait and Ai, or else the bed of the watercourse in the creek. (Palestine Exploration Quarterly Statement, July 1878, p. 132.)

People's Dictionary of the Bible [2]

Vale, Valley. Five Hebrew words are translated "vale" or "valley." 1. Emek, signifying a "deep" broad valley, as the valley of Achor, Aijalon, Elan, Jezreel, Succoth, etc. 2. Gai or Ge, signifying a "bursting," and used to designate narrow ravines or glens, as of Hinnom or Salt.  Deuteronomy 34:6. 3. Nachal, meaning a "wâdy-bed," filled with water in winter, but dry in summer. Such, beds or valleys were Chereth, Eshcol, Sorek, Zered, etc. 4. BikʾAh, properly a "cleft," but applied to a broader space than a cleft or valley, and meaning sometimes a "plain," as that between Lebanon and Anti-Lebanon and Megiddo.  Joshua 11:17;  Joshua 13:17;  Zechariah 12:11. 5. Has-Shephelah, wrongly rendered "vale" in A. V., but "lowland" in R. V., meant a broad tract of low Mils between the mountains of Judah and the coast-plain.  Deuteronomy 1:7;  Joshua 10:40.

King James Dictionary [3]

VALE, n. L. vallis Eng. to fall.

1. A tract of low ground or of land between hills a valley. Vale is used in poetry, and valley in prose and common discourse.

In those fair vales, by nature form'd to please.

2. A little trough or canal as a pump vale to carry off the water from a ship's pump. 3. Vales, money given to servants. avails. Not used in America.

Webster's Dictionary [4]

(1): ( n.) See 2d Vail, 3.

(2): ( n.) A tract of low ground, or of land between hills; a valley.

Smith's Bible Dictionary [5]

Vale. See Valley .