Noun

• S: (n) millennium, millenary (the 1000th anniversary (or the celebration of it))
• direct hypernym / inherited hypernym / sister term
• derivationally related form
• S: (n) millennium, millenary (a span of 1000 years)
• S: (n) millenary (a sum or aggregate of one thousand (especially one thousand years))
• direct hypernym / inherited hypernym / sister term
• S: (n) thousand, one thousand, 1000, M, K, chiliad, G, grand, thou, yard (the cardinal number that is the product of 10 and 100)
• S: (n) large integer (an integer equal to or greater than ten)
• S: (n) integer, whole number (any of the natural numbers (positive or negative) or zero) "an integer is a number that is not a fraction"
• S: (n) number (a concept of quantity involving zero and units) "every number has a unique position in the sequence"
• S: (n) definite quantity (a specific measure of amount)
• S: (n) measure, quantity, amount (how much there is or how many there are of something that you can quantify)
• S: (n) abstraction, abstract entity (a general concept formed by extracting common features from specific examples)
• S: (n) entity (that which is perceived or known or inferred to have its own distinct existence (living or nonliving))

Adjective

• S: (adj) millenary (of or relating to the doctrine of the millennium)
• S: (adj) millenary (relating to or consisting of 1000)
• pertainym
• derivationally related form
• W: (n) millennium [Related to: millenary] (the 1000th anniversary (or the celebration of it))
• W: (n) millennium [Related to: millenary] (a span of 1000 years)