The word "veche/wiec" is derived from a Proto-Slavic root *vēt-, meaning 'council' or 'talk' (which is also represented in the word "soviet"). The semantic derivation that yields the meaning of the word under consideration is parallel to that of parliament.
The East Slavic veche is thought to have originated in tribal assemblies of Eastern Europe, thus predating the Rus' state. It is not clear whether it was a purely Slavic development or it was based on the model of the Varangian Ting. The authority of the veche appears to have been stronger in the north, where the tradition of the Rus' Khaganate lived on.
The earliest mentions of veches in Russian chronicles refer to examples in Belgorod-on-the-Dnieper in 997, Novgorod the Great in 1016 and in Kiev in 1068. The assemblies discussed matters of war and peace, adopted laws, and called for and expelled rulers. In Kiev, the veche was summoned in front of the Cathedral of St Sophia.
The traditional scholarship goes on to argue that a series of reforms in 1410 transformed the veche into something similar to the public assembly of Venice; it became the Commons or lower chamber of the parliament. Аn upper Senate-like Council of Lords (sovet gospod) was also created, with title membership for all former city magistrates (posadniks and tysyatskys). Some sources indicate that veche membership may have became full-time, and parliament deputies were now called vechniks. Some of the more recent scholars call this interpretation into question.
The Novgorod assembly could be presumably summoned by anyone who rung the veche bell, although it is more likely that the common procedure was more complex. The whole population of the city - boyars, merchants, and common citizens - then gathered at Yaroslav's Court or in front of the Cathedral of Holy Wisdom (the latter called a Vladychnoe veche - "An Archbishop's Veche," since it was called in front of the cathedral). The veche bell was a symbol of republican sovereignty and independence and for this reason, Ivan III carted it off to Moscow when he took control of the city, to show that the old way of doing things was at an end.
Separate assemblies could be held in the boroughs or "Ends" of Novgorod. In Pskov the veche assembled in the court of the Trinity cathedral.
According to the Chronicles of Gallus Anonymus, the first legendary Polish ruler, Siemowit, who began the Piast Dynasty, was chosen by a wiec. The idea of the wiec led in 1182 to development of the Polish parliament, the Sejm.
In Yugoslavia this word was used for the houses of the Yugoslavian parliament - veće/веће (slightly different pronunciation with ch being softer than the one in Russian language).