currency unit (esp. Chinese yuan); (bound form) first; original; primary; (bound form) basic; fundamental; (bound form) constituent; part; (prefix) meta-; (math.) argument; variable; era (of a reign); (Tw) (geology) eon

American dollar; US dollar

unit (forming an entity); element; (in a residential building) entrance or staircase

CE (Common Era); Christian Era; AD (Anno Domini)

New Year's Day

element (key component of sth); (chemistry) element; (math.) element (member of a set)

head of state

senior figure; elder; doyen