Englishfor English speakers
re
Preposition
—
regarding; about
In your earlier e-mail re our problems, you made some suggestions.
encounter
Noun
—
An encounter is a meeting, usually one that you don't expect.
I had a pleasant encounter yesterday: an old friend of mine visited me.
My job was really the result of a chance encounter with an old friend, now my boss.
—
An encounter is when two people or groups meet to play a game or fight a battle.
I hope there will be no encounter with other soldiers tomorrow.
This is the fifth World Cup encounter between these two teams.
encounter
Verb
—
If you encounter problems, difficulties, etc., you experience them.
When he did encounter problems, he always knew how to fix them.
—
If you encounter someone, you meet someone, usually unexpectedly.
In the store I encountered my teacher.
—
If you encounter someone, you meet them to play a game or fight a battle.
At night the battle ship encountered enemy planes.
antigen
—
noun
any substance (as a toxin or enzyme) that stimulates an immune response in the body (especially the production of antibodies)