aH

Ah is an interjection used in many languages to express a range of immediate reactions, including realization, understanding, relief, surprise, pain, pleasure, or admiration. In English, it is commonly spelled ah or aah and can appear with short or extended duration: Ah! I see. Aah can express relief or pleasure when drawn out. The related exclamation aha denotes a moment of discovery rather than general emotion.

Phonetically, ah is usually realized as a low open vowel, [a] or [ɑ], with variation in length and tone to convey intensity. Cross-linguistically similar exclamations exist, but spellings and connotations differ. For example, German ach expresses mild surprise or regret, while French ah has overlapping uses but may be less frequent in standard writing.

Orthography and punctuation: ah is typically lower-case inside a sentence, capitalized only at the start, and set off by punctuation that matches the intended tone (comma for a mild remark, exclamation for strong emotion). In dialogue, ah can function as a discourse marker, signaling attention, hesitation, or a shift in stance.

Other uses: besides interjections, ah appears in playful or transliterative contexts as part of expressions or stylized writing. It is not a fixed lexical item with a precise meaning; its sense depends on context, intonation, and language.