E'er is a contraction for the word "ever". The apostrophe represents the missing v, in the same way as the apostrophe represents the missing "no" in "can't", from "cannot"
LG LWHD1500ER 15000 BTU Window Air Conditioner has an energy efficiency rating of 12.0 EER, compared with other products that mostly do not pass 10.0 EER (EER meaning "Energy Efficiency Ratio" and a higher EER means that the air conditioner is more efficient)
Words that have the letters -eer in them are deer, beer, and cheer. Other words that have the letters -eer in them are auctioneer and career.
Reindeer
eer
engineer
Used in texts, "eer" means ever erring which implies ever making mistakes.
Extended ER diagram is a variant of ER diagram. EER include ER diagram + hierarichal concept. Extended ER diagram is also called Enhance ER diagram(EER).
estimated energy requirements
In Russian, "sir" is spelled as "сэр."
eer
associated or engaged
Mountaineer, pioneer