Dictionaries

Луғат online dictionary with over 4000 words.
Glosbe online dictionary. English-Tajik and Tajik-English. This is a collaborative dictionary. You can even log in and add words and phrases to it.
Sahifa English-Tajik online dictionary. 25000 words Sahifa Tajik-English online dictionary. 35000 words
Oxford Living Dictionaries. Type in the English word and get the Tajik translation along with some sample sentences and synonyms. It is only English to Tajik, but if you want Tajik to English do a google search for oxforddictionaries and the Tajik word and it will come up on the top of your google search.
Learn Tajik Some word lists.
Basic dictionary – online single webpage that you can scroll down. English – Tajik
Фарҳангӣ Тафсирии Забони Тоҷикӣ, Part 1 (А-Н) – This is the Tajik-Tajik dictionary. Once you get to a certain point in your language learning this will be much more valuable than a Tajik-English dictionary. It is a huge 950 page PDF, and you can use the Find tool in your web browser to look for words.
Фарҳангӣ Тафсирии Забони Тоҷикӣ, Part 2 (О-Я) – Same as above, 945 page PDF.