Thence, adv.
Etymology: [OE. thenne, thanne, and (with the adverbal -s; see -wards) thennes, thannes (hence thens, now written thence), AS. thanon, thanan, thonan; akin to OHG. dannana, dannan, danan, and G. von dannen, E. that, there. See That.]
1. From that place. "Bid him thence go." Chaucer. When ye depart thence, shake off the dust under your feet for a testimony against them. Mark vi. 11.
Note: It is not unusual, though pleonastic, to use from before thence. Cf. Hence, Whence. Then I will send, and fetch thee from thence. Gen. xxvii. 45.
2. From that time; thenceforth; thereafter. There shall be no more thence an infant of days. Isa. lxv. 20.
3. For that reason; therefore. Not to sit idle with so great a gift Useless, and thence ridiculous, about him. Milton.
1 more senses
4. Not there; elsewhere; absent. [Poetic] Shak.
Shades of meaning
Fernald has no entry of its own for thence; he lists it under therefore.
Where he writes about it:
Accordingly denotes correspondence, which may or may not be consequence; it is often used in narration; as, "The soldiers were eager and confident; accordingly they sprang forward at the word of command." Thence is a word of more sweeping inference than therefore, applying not merely to a single set of premises, but often to all that has gone before, including the reasonable inferences that have not been formally stated. — from therefore
Wherefore is the correlative of therefore, and whence of hence or thence, appending the inference or conclusion to the previous statement without a break. — from therefore