"Extention" is a misspelling of "extension," which has various meanings that include the following:

As a verb, "extension" can mean the act of making something physically longer or larger. It can also be the act of making something longer in duration or the act of straightening or stretching something like an arm or a leg.

As a noun, "extension" can mean the action or process of making something longer or larger or the state of being made longer or larger. The term can also mean the extra time allowed for doing something as in an extension of a deadline. "Extension" as a noun can also mean a part that is added on to something to make it larger or longer as in an extension of a house.

As a noun, "extension" can also mean an extra telephone that is connected to the main line as in an extension number. An "extension" can also be the last part of a computer file name as in .docx, .mp3, or .pdf. The term can also mean a long piece of hair that is added to a person's own hair to make the person's hair appear longer.

Example sentences

  1. The construction project required an extension of the building to accommodate the growing workforce.
  2. I applied for an extension of my student visa to continue my studies in the country.
  3. She filed for an extension of the deadline to submit her tax return.
  4. The extension cord reached the far corner of the room, allowing us to plug in the lamp.
  5. The new highway is an extension of the existing road network, improving connectivity between cities.
  6. My friend regretted cutting her hair short, so she started wearing hair extensions.
  7. The file extension of the document should be .pdf or .docx.
  8. My extension number is #011, so be sure to call me when you need any further questions about the product.
  9. My aunt hired contractors to build an extension of her house for a reasonable price.
  10. The student asked his professor for an extension on the deadline for his thesis because he was sick for two weeks.

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Reference:

extension
1. the fact of reaching, stretching, or continuing; the act of adding to…
definition in the Cambridge English Dictionary
Definition of EXTENSION
the action of extending : state of being extended; an enlargement in scope or operation; the total range over which something extends : compass… See the full definition
Merriam-Webster Logo
Extension Definition & Meaning | Britannica Dictionary
EXTENSION meaning: 1 : the act of extending something: such as; 2 : the act of making something longer or greater
Britannica Dictionary