The letter "Y" can function as both a vowel and a consonant in the English language. In the word "dictionary," the "Y" is serving as a consonant because it is pronounced with a consonant sound, like "d-y". However, your guess that the "Y" makes a long "e" sound like a vowel is incorrect in this case. In some words, such as "fly" or "myth," the "Y" does take on the role of a vowel and creates a long "e" sound. It all depends on the word and its pronunciation.