1 middle third of a month

1 first third of a month

1 last third of the month

1 ten days

2 ten years

3 full period

1 (literary) ten days

2 short period

1 lit. to have only nine meals in thirty days (idiom)

2 fig. (of a family) on the brink of starvation

3 in dire straits

1 pay every ten days, give tribute every month (idiom); incessant and ever more complicated demands