1. (v.t.)affix to fasten or attach: to affix stamps to a letter.
2. affix to add on; append: to affix a signature to a contract.
3. affix to attach (blame, reproach, etc.).
4. (n.)affix something that is joined or attached.
5. affix a bound inflectional or derivational element, as a prefix, infix, or suffix, added to a base or stem to form a fresh stem or a word, as -ed added to want to formwanted, or im- added to possible to form impossible.
Etymology: (1525–35; < L affīxus, ptp. of affīgere to attach, fix =af-af - +fīgere to fasten)
Definition of 'affix'
Princeton's WordNet
1. (verb)affix a linguistic element added to a word to produce an inflected or derived form
2. (verb)affix, stick on attach to "affix the seal here"
3. (verb)append, add on, supplement, affix add to the very end "He appended a glossary to his novel where he used an invented language"
4. (verb)affix attach or become attached to a stemword "grammatical morphemes affix to the stem"
Definition of 'affix'
Webster Dictionary
1. (noun)affix that which is affixed; an appendage; esp. one or moreletters or syllables added at the end of a word; a suffix; a postfix
2. (verb)affix to subjoin, annex, or add at the close or end; to append to; to fix to any part of; as, to affix a syllable to a word; to affix a seal to an instrument; to affix one's name to a writing
3. (verb)affix to fix or fasten in any way; to attach physically
4. (verb)affix to attach, unite, or connect with; as, names affixed to ideas, or ideas affixed to things; to affix a stigma to a person; to affix ridicule or blame to any one
5. (verb)affix to fix or fasten figuratively; -- with on or upon; as, eyes affixed upon the ground
Definitions of affix 
Afrikaans: vasheg
Arabic: يُضِيف، يُلْصِق
Bulgarian: прикрепям
Brazilian: afixar
Czech: připojit, připevnit, přil
German: befestigen, anbringen
Danish: klæbe; fæstne; fastgøre
Greek: επικολλώ
Spanish: pegar, fijar
Estonian: kinnitama
Farsi: ضمیمه کردن؛ چسباندن
Finnish: kiinnittää
French: apposer
Hebrew: לְהַצְמִיד, לְהַדְבִּיק, 
Hindi: संयुक्त करना, जोड़ना
Croatian: zalijepiti
Hungarian: ráragaszt
Indonesian: memasang, membubuhkan
Icelandic: festaá/við
Italian: attaccare, apporre
Japanese: 添える
Korean: 붙이다
Lithuanian: pritvirtinti, priklijuoti
Latvian: piestiprināt
Malay: menampal
Dutch: vasthechten
Norwegian: feste, klebe
Polish: przylepić, przyczepić
Persian: ضمیمه کردن؛ چسباندن
Pashto: یوځای کول
Portuguese: afixar
Romanian: a aplica, a pune (pe)
Russian: прикреплять
Slovak: pripojiť, prilepiť
Slovenian: nalepiti
Serbian: prilepiti
Swedish: fästa
Thai: ติด; ผูก
Turkish: eklemek, iliştirmek
Taiwanese: 黏在…上
Ukrainian: прикріпляти; прикладати
Urdu: چسپاں کرنا
Vietnamese: dán
Chinese: 粘上
