‘十几’ is a Chinese numeral expression meaning 'ten-odd'—specifically, any whole number from 11 to 19. It combines 十 (shí, 'ten') and 几 (jǐ, 'a few' or 'several'), forming an approximate quantifier that signals the teens range without specifying the exact number. Unlike precise numerals like 十一 (11) or 十九 (19), 十几 emphasizes vagueness and estimation, commonly used in casual speech and writing when precision isn’t necessary or unknown.

This term functions as a noun or numeral modifier before measure words or nouns (e.g., 十几个人, 十几年). It’s frequently heard in contexts involving age, quantity, duration, or countable items—such as describing how many people attended, how long something lasted, or how old someone is. It never includes 10 or 20; it strictly denotes numbers beginning with '1' in the tens place and having a non-zero units digit.