An answer to an earlier question about age of wine introduced me to adjectives for specific ages in years. Similarly, there are nouns for periods of time in years. For example:
- bimus & biennium
- trimus & triennium
- quadrimus & quadriennium
Number 1 is expectedly exceptional, and the corresponding words would be anniculus and annus. All these words are mentioned in Lewis and Short.
How far do numbers of this kind extend? It is somewhat laborious to guess more words of this kind and check dictionaries for their existence; a list of all — or most or many — attested forms would be nice. Can such words be derived productively, and if yes, how do I do it?
My guess is that such words exist for 2–10, 100, and 1000, but not for other numbers.
Side note: If you think this question should rather be split in two (one for bimus etc. and one for biennium etc.), I can do that.