Definition
The commitment of money or capital to an asset, enterprise, or instrument with the expectation of generating income, appreciation, or other financial return. In legal contexts, investment carries several distinct meanings depending on the setting:
1. General financial/commercial sense. The outlay of funds into securities, real property, business ventures, or other assets with the purpose of generating profit or preserving capital. This is the dominant modern legal usage and the sense underlying most securities regulation.
2. Trust and fiduciary sense. The placement of trust assets into specific authorized instruments by a trustee or other fiduciary. Fiduciary investment is governed by statute or the terms of the governing instrument and is subject to the prudent investor standard. Not every placement of trust funds qualifies as a legally permissible investment — authorization matters.
3. Bank deposit sense (archaic/historical). An older usage, reflected in Bouvier, treating a sum placed with a bank for safekeeping and payable not in specific currency deposited but in an equivalent sum. This sense has largely fallen away in modern usage.
Common Language
Modern common usage (Wiktionary): A placement of capital in expectation of deriving income or profit from its use or appreciation. Also: the act of surrounding or besieging by an armed force (military sense); a vestment or garment (archaic).
Historical common usage (Webster's 1913): The laying out of money in the purchase of some species of property. Also retained the military sense (blockade or siege) and the vestment sense prominently.
The legal meaning tracks the modern common financial meaning closely, but diverges in two important respects. First, law draws sharp distinctions between investment types that ordinary usage treats as interchangeable — a deposit account, a security, and a real estate purchase are all "investments" in common speech but occupy entirely different regulatory regimes. Second, in the fiduciary context, "investment" is a term of art: a trustee cannot simply place funds anywhere that might generate a return. What constitutes a lawful investment depends on statute, court rules, and the trust instrument — a fact that common usage entirely obscures.
Recognized Forms
/SUBTYPES
Authorized (legal) investment: An instrument or asset explicitly permitted by statute or trust instrument for fiduciary placement. Historically enumerated lists; modern statutes more commonly adopt standards-based approaches.
Prudent investment: Investment meeting the prudent investor standard — measured not by individual security selection in isolation but by overall portfolio strategy and risk management.
Investment security: A negotiable instrument or certificated security held for investment rather than trading or immediate sale, a distinction that can affect both UCC treatment and regulatory classification.
Investment contract: A legal construct under securities law — an arrangement in which a person invests money in a common enterprise with the expectation of profits primarily from the efforts of others. The test derives from SEC v. W.J. Howey Co., 328 U.S. 293 (1946), and determines whether an instrument is a "security" subject to federal registration requirements.
Why It Matters in Research
Regulatory context is everything. The word "investment" appears across bodies of law — securities regulation, trust law, tax, banking, pension law — and its operative meaning shifts with each. A researcher moving from a trust case to a securities enforcement action is not working with the same concept, even though the word is identical. Never assume continuity of meaning across legal domains.
Trust fund investment rules changed dramatically over the twentieth century. Older sources, including Rapalje & Lawrence, reflect a world of enumerated legal lists: statutes specified particular instruments (government bonds, first mortgages) in which trustees could lawfully invest. The modern prudent investor standard, codified in the Uniform Prudent Investor Act (1994) and adopted widely by states, replaced list-based rules with a portfolio theory framework. Historical cases interpreting whether a trustee's "investment" was lawful may apply entirely different criteria than modern doctrine. Research that conflates these eras will reach wrong conclusions.
The Howey investment contract test is a frequent research destination. Courts applying Howey to novel instruments — limited partnerships, cryptocurrency, franchise arrangements — generate a large body of case law under the single concept of whether something constitutes an "investment" in a common enterprise. Researchers need to understand this as a distinct technical inquiry, not merely a financial one.
Tax treatment adds another dimension. The law distinguishes investment income from ordinary income, capital gains from ordinary gains, and investment interest expense from other interest — each with different rate structures and deduction rules. The term "investment" in a tax research context often has a specific statutory definition (see, e.g., Internal Revenue Code § 163(d) for investment interest limitations) that controls regardless of how the underlying asset might be characterized elsewhere.
Older corpus sources using "investment" in the bank deposit sense (Bouvier's usage) are describing what modern law would call a deposit contract or demand account. Do not import that historical definition into modern banking or securities research.
Historical Dictionary Support
The three source dictionaries reflect three different eras and orientations. Black's offers only the spare gloss "money invested" — minimally useful, but honest about the term's simplicity at the definitional core. Rapalje & Lawrence, the most analytically rich of the three here, pivots immediately to the trust fund context and accurately describes the legal framework of its era: enumerated statutory lists of permissible investments for trustees, supplemented by express powers in the governing instrument. This remains the key historical window into pre-prudent-investor trust practice. Bouvier's takes the bank deposit approach — treating investment as a safekeeping arrangement — which reflects an older commercial vocabulary that has since bifurcated into distinct legal categories (deposits, securities, fund placements) with entirely separate regulatory treatment.
None of the three historical dictionaries engages with the securities regulation dimension, which developed primarily in the twentieth century. The investment contract doctrine, the Investment Company Act of 1940, the Investment Advisers Act of 1940, and the modern prudent investor framework all postdate or were nascent at the time these sources were compiled. Historical dictionary support is useful for trust and commercial research in earlier periods; it is an unreliable guide to modern regulatory meaning.
Jurisdictional Note
Permissible trust investments vary by state statute. Most states have adopted versions of the Uniform Prudent Investor Act, but significant variations in default rules, delegation authority, and deviation procedures remain. For pre-twentieth-century trust research, the applicable state's enumerated legal list — not a uniform standard — controls.
Encyclopedia Cross-Reference
Investment Companies and the Investment Company Act of 1940 — Law Mind Business Organizations & Corporate Law Encyclopedia, §business_114
Investment Advisers Act of 1940 — Law Mind Business Organizations & Corporate Law Encyclopedia, §business_115
Investment Interest Expense — Law Mind Tax Encyclopedia, §tax_140