What does "irs" mean?

Initialism of inertial reference system.

Irs

Common synonyms include: cbp, inertial navigation system, inertial reference system, ins, ins, instant replay system.

//ˈaɪ.ɑɹ.ɛs// name, noun

name, noun ·Uncommon ·Advanced level

Noun

1
Initialism of inertial reference system. abbreviation, alt-of, countable, initialism, uncountable
2
Initialism of interest rate swap. abbreviation, alt-of, initialism
3
plural of IR form-of, plural
4
the bureau of the Treasury Department responsible for tax collections wordnet
5
Initialism of Interface Requirements Specification. abbreviation, alt-of, countable, initialism, uncountable

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6
Initialism of instant replay system. abbreviation, alt-of, countable, initialism, uncountable

Proper Noun

1
Initialism of Internal Revenue Service. US, abbreviation, alt-of, initialism
"[…] It is going to be up to the taxpayer, if they receive a 1099 in any form for a nontaxable event, such as splitting rent among roommates, splitting a dinner bill, or even selling something on eBay for less than you paid for it, to explain to the IRS that the 1099 was received for a non-taxable transaction,” said Mark Luscombe, principal analyst for tax publisher Wolters Kluwer Tax & Accounting."
2
Initialism of Indian Revenue Service. India, abbreviation, alt-of, initialism