co

Everyday

1. Co. is short for «company», often in business names, like «Smith & Co.». tree →
2. Co. is short for «county» in Ireland, as in «Co. Cork». tree →
3. Co- at the start of a word means together or jointly, as in co-pilot, co-worker, cooperate. tree →
4. c/o (care of) on letters means «at the address of». tree →
5. CO is the chemical formula for carbon monoxide, a dangerous gas. tree →

In the lessons

It is a fragment, not a full word. On shop signs «& Co.» means «and partners». In Ireland, «Co. Kerry» is a county. In science, CO (carbon monoxide) is a poisonous gas with no smell; homes have CO alarms for safety. Phrases: and Co., Co. Dublin, co-pilot, co-author.

Examples

• The bakery is called Jones & Co. tree →
• My granny lives in Co. Galway in Ireland. tree →
• The co-pilot helps fly the plane. tree →
• The book has two co-authors. tree →
• We have a CO alarm in the kitchen to warn us of carbon monoxide. tree →
• Send the letter c/o Mrs Brown. tree →
• Longman & Co. to be published. tree →

Note

An abbreviation and a prefix, not a word on its own. «Co.» (company or county) has a full stop in UK style. CO in capitals is carbon monoxide; «Co» with a small o is the element cobalt. «Co-» can be written with or without a hyphen (co-operate, cooperate).

In Jewish tradition

It is a fragment, not a full word. On shop signs «& Co.» means «and partners». In Ireland, «Co. Kerry» is a county. In science, CO (carbon monoxide) is a poisonous gas with no smell; homes have CO alarms for safety. Phrases: and Co., Co. Dublin, co-pilot, co-author.

Examples

• FRANK & CO., PUBLISHERS AND PRINTERS, (Sefer Yetzirah, Kalisch 1877) tree →
• Meroz has argued that the SY envisions Wisdom [חָכְמָה Chochmah] as a co-participant with God in the Work of Creation. (Sefer Yetzirah, Sefaria community translation) tree →

Note

An abbreviation and a prefix, not a word on its own. «Co.» (company or county) has a full stop in UK style. CO in capitals is carbon monoxide; «Co» with a small o is the element cobalt. «Co-» can be written with or without a hyphen (co-operate, cooperate).