What is the meaning of the pali word "Viveko"? I was reading through some Suttas and a word solitude was found. I looked up the original pali sutta for the word and found that word "Viveko" is getting translated as solitude. 
I have a sanskrit background and I studied sanskrit when I was in 8th standard. The word Viveko seems to have been derived from the sanskrit word vivek. 
Vivek means discretion , wisdom , true knowledge,investigation , consideration etc..but it does not mean solitude.(Solitude means privacy)
Here is the sutta which uses the word solitude :


  Two thoughts occur to him, The Tathāgata, the Awakened One Who endured
  what is beyond endurance: Security (for beings) was the first thought
  spoken of, Solitude was the second announced.


Its pali version is as follows :


  “Tathāgataṃ buddhamasayhasāhinaṃ,  Duve vitakkā samudācaranti naṃ; 
  Khemo vitakko paṭhamo udīrito,  Tato viveko dutiyo pakāsito.


My question is : What is the meaning of the pali word "Viveko" ?
According to this wisdomlib.org page, "viveka" in Pali means:


  viveka : (m.) detachment; seclusion.
  
  (Source): BuddhaSasana: Concise Pali-English Dictionary
  
  Viveka, (fr. vi+vic) detachment, loneliness, separation, seclusion;
  “singleness” (of heart), discrimination (of thought) D. I, 37, 182;
  III, 222, 226, 283=S. IV, 191 (°ninna citta); S. I, 2, 194; IV, 365
  sq.; V, 6, 240 sq.; A. I, 53; III, 329; IV, 224; Vin. IV, 241; Sn.
  474, 772, 822, 851, 915, 1065; Nd1 158, 222; J. I, 79; III, 31; Dhs.
  160; Pug. 59, 68; Nett 16, 50; DhsA. 164, 166; ThA. 64; PvA. 43; Sdhp.
  471.—viveka is given as fivefold at Ps. II, 220 sq. and VbhA. 316, cp. K. S. I. 321 (Bdhgh on S. III, 2, 8), viz. tadaṅga°, vikkhambhana°,
  samuccheda° paṭippassaddhi°, nissaraṇa°; as threefold at Vism. 140,
  viz. kāya°, citta°, vikkhambhana°, i.e. physically, mentally,
  ethically; which division amounts to the same as that given at Nd1 26
  with kāya°, citta°, upadhi°, the latter equivalent to “nibbāna. ” Cp.
  on term Dial. I. 84. See also jhāna. Cp. pa°. (Page 638)
  
  (Source): Sutta: The Pali Text Society's Pali-English Dictionary


There is a sutta by this name, Viveka Sutta, or the sutta on seclusion.

According to Palikanon.com on viveka:


  viveka
  
  'detachment', seclusion, is according to Niddesa, of 3 kinds:
  
  (1) bodily detachment (kāya-viveka), i.e. abiding in solitude free
  from alluring sensuous objects;
  
  (2) mental detachment (citta-viveka), i.e. the inner detachment from
  sensuous things;
  
  (3) detachment from the substrata of existence (upadhi-viveka).
  
  In the description of the 1st absorption,
  
  the words "detached from sensuous things" (vivicc' eva kāmehi) refer,
  according to Vis.M. IV, to 'bodily detachment';
  
  the words "detached from karmically unwholesome things" (vivicca
  akusalehi dhammehi) refer to 'mental detachment';
  
  the words "born of detachment" (vivekaja), to the absence of the 5
  hindrances.


This book excerpt discusses "viveka" and its different meanings in Pali and Sanskrit. It's too long to quote here.