Princeton's WordNet

1. dissertation, thesis(noun)

   a treatise advancing a new point of view resulting from research; usually a requirement for an advanced academic degree

Kernerman English Learner's Dictionary

1. dissertation(noun)ˌdɪs ərˈteɪ ʃən

   a long research paper written as part of a graduate degree program

Wiktionary

1. dissertation(Noun)

   A formal exposition of a subject, especially a research paper that students write in order to complete the requirements for a doctoral degree; a thesis.

2. dissertation(Noun)

   A lengthy lecture on a subject; a treatise; a discourse; a sermon.

Origin: dissertationem, from dissertare.

Webster Dictionary

1. Dissertation(noun)

   a formal or elaborate argumentative discourse, oral or written; a disquisition; an essay; a discussion; as, Dissertations on the Prophecies

• verhandeling, diskoersAfrikaans
• بَحْث، رِسالَه عِلْمِيَّهArabic
• дисертацияBulgarian
• dissertaçãoPortuguese (BR)
• disertaceCzech
• die DissertationGerman
• disputats; afhandlingDanish
• διατριβήGreek
• tesina, disertaciónSpanish
• väitlus, väitekiriEstonian
• پایان نامه؛ تزFarsi
• väitöskirjaFinnish
• exposé, mémoireFrench
• עֲבוֹדַת מֶחקָרHebrew
• शोध निबंधHindi
• disertacijaCroatian
• értekezés, disszertációHungarian
• disertasiIndonesian
• ritgerð, fyrirlesturIcelandic
• dissertazioneItalian
• 学位論文Japanese
• 논문Korean
• disertacijaLithuanian
• disertācijaLatvian
• hujah yang halusMalay
• proefschriftDutch
• avhandlingNorwegian
• rozprawaPolish
• پایان نامه؛ تزPersian
• ديسرټيشن (هغه اثر چه دډاكټرى ددرجې اخيستلو دپاره ليكل كېږى)، مقاله، رساله، رسمى ليكنهPashto
• dissertaçãoPortuguese
• dizertaţieRomanian
• диссертацияRussian
• dizertáciaSlovak
• disertacijaSlovenian
• disertacijaSerbian
• [doktors]avhandlingSwedish
• ปริญญานิพนธ์Thai
• tez, doktora teziTurkish
• (如為取得學位所做的)學術論文，(如為取得學位所做的)學術發表Chinese (Trad.)
• дисертаціяUkrainian
• کسی موضوع پر تفصیلی مقالہUrdu
• luận vănVietnamese
• 论文，学术演讲Chinese (Simp.)