There are 2 main definitions of sim in English:

sim1

Line breaks: sim
Pronunciation: /sɪm
 
/

noun

informal
A video game that simulates an activity such as flying an aircraft or playing a sport: [with modifier]: a flight sim
More example sentences
  • There are also quite a few flight sims that simulate modern or historic aircraft.
  • The core gameplay concept is team action strategy, a three-tier model that combines aspects of action space sims, tactical naval sims, and RTS games.
  • But I honestly don't see myself getting excited by sports sims.

Origin

late 20th century: abbreviation of simulation (see simulate).

Definition of sim in:

There are 2 main definitions of sim in English:

SIM2

Line breaks: SIM
Pronunciation: /sɪm
 
/
(also SIM card)

noun

A smart card inside a mobile phone, carrying an identification number unique to the owner, storing personal data, and preventing operation if removed.
More example sentences
  • When a phone is stolen, the owner's account-details of which are stored on the SIM card slotted into the phone-is frozen.
  • Pitchford said she had the ‘shock of her life’ when one of the youths asked her to remove her SIM card and hand over her cellphone.
  • Many carriers use the SIM card (subscriber identity module) or smart card.

Origin

1980s: acronym from subscriber identification module.

Definition of sim in: