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- a arddo diroedd a gaiff ddigonedd
- a bird in the hand is worth two in the bush
- a ddwg wy a ddwg fwy
- a man is known by the company he keeps
- aantrekken
- aanval
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- abbreviate
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- abdomen
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- able
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- abnormality of mind
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- above the line
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- abrupt
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- absence
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- absent
- absoliwt
- absolute
- absolute discharge
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- absorb
- abstain
- abstract
- abstract dance
- abuela
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- abundant
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- abuse
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- abuses
- abuses of process
- abusive
- abusive language
- ac
- acabar
- academaidd
- academic
- academics
- academies
- academy
- academyddion
- acampar
- accelerate
- accent
- accented
- accents
- accept
- acceptable
- acceptar
- accepter
- access
- accesses
- accessory bone
- accettare
- accident
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- accidental offside
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- acclimatize
- accompany
- account
- account book
- accountancy
- accountant
- accounting
- accounting machine
- accounting profit
- accounts
- accourir
- accrual
- accrue
- accueillir
- accumulate
- accurate
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- accuse
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- acen
- acenion
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- aceptar
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- achieve
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- achosion
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- achubodd
- achubol
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- achwyn
- acid
- acidic
- acidic gas
- acids
- acil çıkış
- acknowledge