Correct spelling for the English word "Increasement" is [ˈɪnkɹiːsmənt], [ˈɪnkɹiːsmənt], [ˈɪ_n_k_ɹ_iː_s_m_ə_n_t] (IPA phonetic alphabet).
The word "increasement" is formed by adding the suffix "-ment" to the word "increase".
The term "increase" originated from the Old French word "encreistre", which came from the Latin word "increased" (principle parts: "increas-", "increasere", "increvi", "increatum"). "Increase" entered the English language around the 14th century, used to refer to the action or process of growing or becoming larger in size, quantity, or degree.
The suffix "-ment" is derived from the Latin suffix "-mentum" which forms nouns indicating an action, process, or result. It was adopted into English during the Middle English period.
Overall, the word "increasement" has been formed by combining these elements: "increase" indicating growth or enlargement, and the suffix "-ment" to denote the action or process of increasing.