tranquillitate
tranquillitate is a Latin form of tranquillitas, meaning “calm, tranquility”. It is the ablative singular feminine noun.
Found 25 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 5.23.6: quod aequinoctium suberat, necessario angustius milites collocavit ac summa tranquillitate consecuta, secunda inita cum solvisset vigilia, prima luce terram attigit omnesque incolumes naves perduxit.
All forms of tranquillitas (declension table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.