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a
/ˈeɪ/
/ˈeɪ/, /ə/
1
used when we want to talk about a person or thing for the first time or when other people may not know who or what they are
1.1
used before a noun when we are not talking about a specific person or thing
1
the musical pitch A, which is a specific note in the diatonic scale commonly used in Western music
2
a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
6
any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
7
one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
synonyms : deoxyadenosine monophosphate
Examples
1. The wheel of the bicycle had a hub at its center.
2. Opportunity makes a thief.
3. A pilot must have good vision and quick reflexes.
4. My grandmother made a dress for me.
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