Twelvemonth
/ˈtwelvmʌnθ/
Definition 1 of 1
Pro Tip 1/3Archaic Usage
The term 'twelvemonth' is rarely used today and sounds old-fashioned. 
He spoke of a twelvemonth as if we still lived in medieval times.
Pro Tip 2/3Literary Flair
Writers may use 'twelvemonth' to give a historical or poetic touch to their work. 
She promised to return in a twelvemonth, on the next springtide.
Pro Tip 3/3Time Span
'Twelvemonth' emphasizes the duration of twelve months, rather than just stating 'year'. 
They traveled the world for a full twelvemonth.