The word for "every two years" is biennial. The adverb is "biennially". Notice the similarity to the familiar "bicentennial", indicating 200 years. Also used are the terms "biannually", and "biyearly", which might have had a hyphen at some point.
Each/every/once a year.
yearly maybe.Annual means once every season and in banking that's most likely a year
Almost every word is a synonym for something - or an antonym.
each, all, every single
Biennially
Not every word has a synonym...literal classifications such as strawberry and laptops don't necessarily have great synonyms or antonyms.
cada otro año.is the way as you say every other year.
Every state is different...in Il it's the odd year every other year and the teachin license it's every other year but in the even year.
only on thursdays of every other week of every other month of every other year.
annum
A decade.
Instill can be synonym or antonym. It is a synonym of implant, introduce, inspire, and other words. It is an antonym of take out, leave alone, dislodge, and other words.