one of the 12 months of the year 日历月◆We finalize the accounts on the last day of each calendar month. 我们在每个日历月的最後一天结账。
a period of time from a particular date in one month to the same date in the next one 一整月的时间（从某月某日到下月同一日的期间）◆Payment must be received within one calendar month from date of invoice. 从发票出具之日起一月内必须收到付款。