A bimester is a period of two months. The months, on the other hand, are the twelve parts into which a year is divided according to the Gregorian calendar: January, February, March, April, May, June, July, August, September, October, November and December.

This means that a year has six bimesters (six groups of two months each can be formed). Starting in the first month of the year, the six bi-months would be January-February, March-April, May-June, July-August, September-October, and November-December.

Bimesters, however, can be formed in different ways. If we take the months of February and March, a two-month period (February-March) can also be formed, just like August-September or October-November.

You can also group the two- month periods by “cutting” the months. For example: from March 15 to May 15 there is a two-month period. This means that the two-month period in question begins on March 15 (and not March 1) and runs until May 15 (not until 1 or 31).

Beyond bimestres, other methods of grouping of the month, as the quarters (three months), quarters (four months) and the semester (six months). The use of one or the other system depends on the needs. There are services that, in some countries, are usually billed every two months. A bimonthly billing of the electric power service, to cite one case, leads the user to pay his bill every two months. Electric energy consumption, in turn, is also measured per two-month period for its corresponding collection.

The concept of bimester does not arise from the observation of nature, as it does with that of the month, which is derived from a series of factors related to the movement of the Earth around the Sun and the way in which this affects its different regions. On the contrary, grouping the months, or splitting them, arises from the particular needs of human beings to organize their time in a way that adjusts to their rhythm of life.

Grouping elements of a set has benefits, but it can also lead to certain setbacks: although on the one hand it helps us to “say more with less”, this results in a lack of information that is sometimes negative for communication. For example: if we take the phrase “tomorrow begins a new two-month period” out of context, we lack data to understand at what time of year the issuer is; if instead it said “March begins”, no clarification would be necessary.

But this does not mean that the lack of information is always negative; On the contrary, within the appropriate scope, in which all participants in the communication process are aware of the way in which the months have been grouped, the use of a concept as a two- month period can be very practical to avoid unnecessary clarifications and focus at points of interest.

In a school where courses are divided into bimonths, for example, both teachers and students use this term to refer to the different stages of the year, and this allows a level of order more suited to their objectives. If everyone knows that the first two months begins on March 1, to talk about the second it is not necessary to say “in May and June.”

A student can express that it was only during the last two months that they managed to internalize the concepts of chemistry, and in their environment no one will ask them “what month do you mean?” Similarly, it is possible to note that “the first half of the two-month period was more difficult. On the other hand, if we wish to emphasize a specific event within this structure, we can well specify the month in which it took place: “in November they admitted Sergio. “