In the case of foreign specialised dictionaries, on the one hand the number of languages – in this respect we may distinguish mono-, bi- and multilingual dictionaries – is a significant data, while on the other hand, in the case of bi- and multilingual specialised dictionaries of a given field, the source and target languages, in most cases English, French, German, and Russian besides Hungarian, indicate the trends of mediation concerning international scientific and technological knowledge. The early stage of compiling technological dictionaries in Hungary was characterised by the ambition to establish the sovereign usage of Hungarian scientific language and the vocabulary of trades, which were mostly introduced with the mediation of the German language within the Austro-Hungarian Monarchy. Thus the first bilingual specialised dictionaries, initially German–Hungarian, were published including fields such as printing (Szilády 1982, Pusztai 1902), mining (Pettkó 1845, Szabó 1848, Péch 1879, Szeőke 1903), rail (Ozoray 1872, Révész 1885–1886, Görgey 1886–1887), shipping (Kenessey 1865, Rónay 1917) and flight (Nagy Aeoro-Szövetség 1920). The role of German language in editing scientific and technological dictionaries remained important along with the vigorous expansion of English at the end of the 20th century. This tendency can be observed in the trilingual (Hungarian, German, English) dictionaries of architecture (Urban–Soós 2002, Urban 2004, 2006, 2008, 2011) and the automobile industry (Auto Parts-X-Meditor Ltd., on-line). Russian language emerged from the 1950s on in several volumes of the Technical Dictionary Series presenting terms and expressions in three languages (Hungarian, German, Russian: Palotás 1959) or four languages (Hungarian, English, German, Russian: Varga–Széchy–Kézdy–Lazányi 1960, Barta–Kozma 1964, Rédey– Klár 1969, Nagy–Medek–Klár–1971, Frigyes 1973, Székely–Szepesi 1980, Redl–Oldal 1983).