Definition of a

1. a [ d ] indefinite article

2. A [ n ] the blood group whose red cells carry the A antigen

 Related Terms blood_group

3. A [ n ] a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation

 Related Terms metric_linear_unit nanometer picometer

4. a [ o ] pronoun, third person singular impersonal

5. a [ n ] the 1st letter of the Roman alphabet

 Related Terms letter Roman_alphabet

6. A [ n ] any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes

 Related Terms fat-soluble_vitamin vitamin_A2 vitamin_A1

7. a [ n ] (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA

 Related Terms purine ribonucleic_acid deoxyribonucleic_acid biochemistry

8. a [ p ] preposition, rate, performance, cost, or other unit relative to one of

9. a [ p ] preposition to indicate purpose
Examples: "I brought these for you." "What is this button for?" "In order to get it, you have to read it." "I went to London to see the Queen."

10. a [ n ] one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)

 Related Terms nucleotide

11. A [ n ] the basic unit of electric current adopted under the System International d'Unites
Examples: "a typical household circuit carries 15 to 50 amps"

 Related Terms current_unit abampere milliampere

Rhymes with

a may se ne wei quay lay k day ley wy gay dey bay ney yay de mei pei fey ray cay weigh say paye fe to bey way whey re pay tay yea le nay lei they shay the hey jay j. hay j ia array ca dah play slay sway sleigh pray prey brae stay bray clay dray drey gray fray frey trey tray flay grey the huh whey ola okay tia ok ida ossa maia pia obey oka ira rhea maya ada aga away aura abbe iva ara soya anna ana allay boa moray ala cia cira da ca dia era ela essay allah gaia gaea via goa noah noaa goya shia thea osha asia ga ha hua spray stray iowa essay toda okra liza zola opera llama lire korea sauna rama sana orca saute luba purvey lira kera into vena lyra vela mala vega lassa veda vara luna rana polka lima lama wajda tara manna valet sima riga manet zeta rima mamma mara leda masa mecca mama paca suva papa kappa yuma susa survey rota mica sura viva millay rosa sousa para micah lhasa vitae repay mola momma santa's mocha mesa pappa serra nyssa scilla roma

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