Word of the Day - 08/19/26
proclivity
/proʊ'klɪvɪti/(n.): a natural inclination
His proclivity for late-night snacks led him to make furtive trips to the kitchen whenever everyone else was asleep.
Word Origin
The word 'proclivity' originates from the Latin 'proclivitas', meaning 'a tendency' or 'inclination'. This in turn comes from 'proclivis', meaning 'sloping forward' or 'inclined'. The word 'proclivis' can be broken down into 'pro-' (forward, forth) and 'clivus' (a slope, hill). Thus, 'proclivity' literally implies a 'leaning forward' or 'down a slope' which evolved metaphorically to mean a natural tendency or inclination.
Words with similar origins include 'declivity', meaning a downward slope, from Latin 'declivitas' (de- 'down' + clivus 'slope'). Another is 'acclivity', meaning an upward slope, from Latin 'acclivitas' (ad- 'to, toward' + clivus 'slope'). 'Incline' and 'decline' also share a root related to leaning or sloping, from Latin 'clinare' ('to lean').