| อักษรโรมัน | akL saawnR rohM manM | noun | Roman alphabet |
| อักษรละติน | akL saawnR laH dtinM | noun | Latin alphabet |
อักษรเลข | akL saawnR laehkF | noun | numerical digits or characters |
| อักษรศาสตร์ | akL saawnR saat[dr]L | noun, proper noun, phrase, formal, loanword, Sanskrit | Art of letters; Faculty of Arts |
| อักษรศาสตร์มหาบัณฑิต | akL saawnR saat[dr]L maH haaR banM thitH | noun | Master of Arts |
| อักษรสูง | akL saawnR suungR | noun | high-class consonant |
อักเสบ  | akL saehpL | attributive verb | [is] inflamed; infected; swollen |
| noun | inflammation; redness; swelling; infection |
| noun | [การอักเสบ] inflammation |
| อักอ่วน | akL uaanL | | [alternate spelling of กระอักกระอ่วน] |
| อัคคี | akL kheeM | noun | fire; conflagration |
| อัคคีภัย | akL kheeM phaiM | noun | pestilential fire |
| อัคนี | akL neeM | adjective | igneous |
| อัคร | akL khaH raH | adjective, formal, poetic, loanword, Sanskrit | excellent; top; preeminant; first; foremost; principal; best |
| อัครชายา | akL khaH raH chaaM yaaM | noun | first (preeminant) wife (among current wives); head consort |
| อัครราชทูต | akL raH raatF thuutF | noun | a government envoy having the rank of minister |
| อัครศาสนูปถัมภก | akL khaH raH saatL saL nuupF thamR phohkH | noun | the Thai King as protector of religions |
| อัครสาวก | akL khaH raH saaR wohkH | noun | apostle; first disciple |
| อัง | angM | verb | to warm over a fire |
 อังกฤษ | angM gritL | proper noun, geographical, adjective | England; English; Great Britain; British |
| noun | [คนอังกฤษ] English person |
| of or pertaining to the English language |
| proper noun, geographical | [ประเทศอังกฤษ] England |
| noun | [ภาษาอังกฤษ] the English language |
| อังกอร์ | angM gaaw[r]M | proper noun | Angkor |
อังกอร์วัด  | angM gaaw[r]M watH | proper noun | Angkor Wat, palaces and capital of the ancient Angkor kingdom (800-1200 A.D.) about which little is known |
| อังการา | angM gaaM raaM | proper noun, geographical | Ankara, the capital city of Turkey |
| อังคั่น | angM khanF | | [name of] the Thai punctuation sign (ฯ) when used to show the end of a chapter or episode |
| อังคั่นคู่ | angM khanF khuuF | noun | [name of] the Thai punctuation sign (๚) showing the end of a chapter or episode |
| อังคาร | angM khaanM | proper noun | [general] Mars |
| noun | cremated remains of a decedant |
| noun | [ดาวพระอังคาร] the planet Mars |
| noun | [วันอังคาร] Tuesday |
| อั้งยี่ | angF yeeF | noun | a Chinese secret society, a tong, a racket |
| อัจฉริย | atL chaL riH yaH | adjective | extremely intelligent; genius |
| อัจฉริยบุคคล | atL chaL riH yaH bookL khohnM | noun | genius person |
| อัจฉริยะ | atL chaL riH yaH | | [alternate spelling of อัจฉริย] |
| อัชฌาสัย | atL chaaM saiR | noun | politeness; good behavior |
| noun | good character |
| อัญ | anM | pronoun, formal, poetic, archaic, ancient, loanword, Khmer | I; me |
| adjective, formal, poetic, loanword, Pali | other; different; differing; unlike the others |
| อัญขยม | anM khaL yohmR | pronoun, poetic | I; me |
| อัญมณี | anM maH neeM | noun, phrase, formal, loanword, Pali | precious stones, jewel, gems; [ancient] other valuable objects or belongings |
| อัญมณีกึ่งมีค่า | anM maH neeM geungL meeM khaaF | noun | semi-precious stone |
| อัญรูป | anM ruupF | noun | allotropy |
| อัฐ | atL | noun, proper noun, formal, archaic | [an obsolete unit of the old Siam currency] money; satang |
| adjective, loanword, Pali | [Pali numeral] eight; [usually used as a prefix] eighth |
| อัฐศก | atL sohkL | noun | eighth year of the decade |
| อัณฑะ | anM thaH | noun | testicles |
| อัด | atL | verb | to press; squeeze; compress; cram in; to record video or audio |
| verb | to hold the breath; inhale |
| attributive verb | [is] compressed; crushed; closely packed |
| อัดฉีด | atL cheetL | verb | [automotive] to lubricate |
| อัดถั่วดำ | atL thuaaL dahmM | noun, verb, vulgar, idiom | male-male anal intercourse |
| อัดภาพ | atL phaapF | verb | to make a video recording |
| อัดสำเนา | atL sahmR naoM | verb | copy (with machine); duplicate |
| อัดเสียง | atL siiangR | verb | to make an audio recording |
| อัดหม้อไฟใหม่ | atL maawF faiM maiL | verb | to recharge a battery |
| อัต | atL dtaL | noun, particle, formal, loanword, Pali | self; individual |
| อัตคัด | atL khatH | adjective, formal | destitute; penniless; down and out; impoverished; indigent; insolvent; moneyless; penurious; poor; poverty-stricken |
| อัตคัดขัดสน | atL khatH khatL sohnR | adjective, phrase, formal | on one's uppers; (to live) in straitened circumstances; destitute; penniless; down and out; impoverished; indigent; insolvent; moneyless; penurious; poor; poverty-stricken |
| อัตต์ | at[d]L | | [alternate spelling of อัต] |
| อัตตา | atL dtaaM | adjective, loanword, Pali | [the prefixes] self- and auto- |
| อัตนัย | atL naiM | adjective | subjective |
