The most profound change brought upon the country by the passing of the new constitution was the overthrow of the monarchy on a de jure level (the monarchy had been de facto abolished in the referendum of 1924). Article 2 established a republic (the word used in the constitution is "Δημοκρατία", which can mean both democracy and republic).
The most profound impact of the new constitution was the abolition of the monarchy on a formal level, which had been effectively ended by the 1924 referendum. Article 2 then established a system of government (the word used in the constitution is "Δημοκρατία", which can mean both democracy and republic).