The spelling of the word "at wed" can be explained using the International Phonetic Alphabet (IPA). The first syllable "at" is pronounced as /æt/, using the vowel sound "æ" as in "cat". The second syllable "wed" is pronounced as /wɛd/, using the vowel sound "ɛ" as in "red". The correct spelling of the word is actually "atwedd", meaning "joined together". The incorrect spelling of "at wed" is likely a result of mishearing or mistyping the actual word.
There is no standard dictionary definition for the term "at wed." It seems to be a phrase or combination of words that is either incorrect or not widely recognized.